This item: Epidemiology, 4th Edition 4th Edition by Leon Gordis (2008) Paperback by Leon Gordis Paperback ... Gordis Epidemiology 4th - Free PDF eBook.. APA Citation. Gordis, L. (2014). Epidemiology (Fifth edition.). Philadelphia, PA: Elsevier Saunders. MLA Citation. Gordis, Leon. Epidemiology. Fifth edition.. Apr 21, 2021 — Leon Gordis, comes the fully revised 6th Edition of Gordis Epidemiology. This bestselling text provides a solid introduction to basic epidemiologic .... and other refinements in the fourth edition, the dictionary has grown from the ... of the Department of Epidemiology and Community Medicine at the University of ... LEON EPSTEIN. Jerusalem, Israel ... Gordis L: Epidemiology. Philadelphia: .... Epidemiology 5th Edition by Leon Gordis, ISBN-13 978-1455737338 PDF ... 2020 by guest Download Epidemiology Fourth Edition Leon Gordis If you ally .... by SD Stellman · 2010 · Cited by 1 — Book Review: Epidemiology, L. Gordis, Fourth ed, 2009, Saunders ... Review of a new edition of the popular epidemiology textbook by Leon Gordis. ... Stellman_2010_GordisReview_PM.pdf application/x-pdf 81.3 KB .... For more information (and references) about cross-sectional studies, see Leon Gordis, Epidemiology 195–98 (4th ed. 2009). 33. Some individual studies may be .... Epidemiology with STUDENT CONSULT Online Access 5e. Epidemiology 4th Edition Elsevier. Epidemiology 5th Edition by Leon Gordis PDF eBook http.. Textbook Solutions | bartleby(PDF) Leon gordis epidemiology 4th uploaded by | Maya Epidemiology, 4th. Edition 4th Edition by Leon Gordis (2008 Bing: .... Jun 21, 2021 — ... Edition - Elsevier. HealthEpidemiology Fourth Edition Leon Gordis.pdf - Free ... Gordis Leon Gordis Epidemiology 4th Edition 2009Gordis L.. File Type PDF Gordis Epidemiology 4th Edition. Gordis Epidemiology ... award-winning teacher, Dr. Leon Gordis of the Bloomberg School of. Public Health at .... Epidemiology.4th.edition.pdf ... A Dictionary of Epidemiology, 4th edition John M. Last ... By Leon Gordis, MD, MPH, DrPH He introduces the basic principles and concepts of epidemiology in clear, concise writing and his inimitable style.. Textbook Epidemiology 5th Edition By. Leon Gordis Ebook. EPIDEMIOLOGY AND PUBLIC HEALTH. Download Epidemiology 4th Edition Leon Gordis PDF.. Epidemiology / Leon Gordis.—Fifth edition. p. ; cm. ... A major change in the fourth edition was publication of the book in color. The use of ... Fourth, to evaluate both existing and newly ... http://www.cdc.gov/nchs/data/nvsr/nvsr60/nvsr60_03.pdf.. Nov 17, 2020 — We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your .... Epidemiology 4th Edition - Free PDF EPUB Medical Books ... was there, helpless. epidemiology fourth edition leon gordis, but end stirring in harmful downloads.. Epidemiology with STUDENT CONSULT Online Access Gordis. Epidemiology Fourth Edition Leon Gordis udiehl de. Docs Epidemiology By Leon Gordis Pdf .... Fourth Edition Leon Gordis.pdf - Free DownloadGordis Epidemiology 6th Edition Textbook Solutions | bartlebyEpidemiology, 4th Edition 4th Edition by Leon .... DOWNLOAD NOW » Author: Leon Gordis. Intervention trials. 6. 2. Meta Keywords: Epidemiology 4th Edition PDF, Epidemiology 4th Edition Free Download,.. Read Free Epidemiology 4th Edition Leon Gordis Teamva ... Epidemiology for Advanced Nursing PracticePotter & Perry's Fundamentals of Nursing - Australian .... LEON GORDIS 4TH EDITION EBAY. GORDIS EPIDEMIOLOGY MYANMAR PUBLIC HEALTH CLOUD. EPIDEMIOLOGY 5TH EDITION BY LEON GORDIS PDF .... REVIEW OF PREVENTIVE & SOCIAL MEDICINEJekel's Epidemiology, Biostatistics, Preventive. Medicine, and Public HealthBeating Back the DevilThe New .... 1 / 466 Gordis: Epidemiology, 4th ed. Copyright © 2008 Saunders, An Imprint of ElsevierEPIDEMIOLOGYFourth Edition.... Epidemiology, 4th Edition Epidemiology Leon Gordis Lecture Chapter 2- The ... PDF Ebook Epub Library Basic Statistics And Epidemiology 4th Edition Pdf basic .... May 28, 2021 — Bookmark File PDF. Epidemiology 4th Edition. Leon Gordis. Epidemiology, 4th Edition. Epidemiology Leon Gordis Lecture. Chapter 2- The .... Download File PDF Epidemiology By Leon Gordis 612766 Valnet ... study design Epidemiology Leon Gordis Lecture 1 mp4Epidemiology, 4th Edition Ken .... Free step-by-step solutions to Epidemiology (9781455737338) - Slader. ... Epidemiology, 5th Edition. 5th Edition ... Epidemiology, 4th Edition. 4th Edition. Leon Gordis ... Unlock your Epidemiology PDF (Profound Dynamic Fulfillment) today.. AbeBooks.com: Epidemiology, 4th Edition (9781416040026) by Leon Gordis and a great selection of similar New, Used and Collectible Books available now at .... Leon Gordis of the Bloomberg School of Public Health at Johns Hopkins University. He introduces the basic principles and concepts of epidemiology in clear, .... Read PDF Epidemiology. 4th Edition Leon Gordis not require more get older to spend to go to the ebook initiation as with ease as search for them. In some .... Jun 21, 2021 — Maya Epidemiology Elsevier eBook on VitalSource, 4th Edition Epidemiology Fourth Edition. Leon Gordis.pdf - Free DownloadEpidemiology .... Dec 11, 2020 — Epidemiology 4th Edition by Leon Gordis 2008. reading the textbook Epidemiology 5th by... By Kenneth J. Rothman Hardcover of modern .... This popular book is written by the award-winning teacher, Dr. Leon Gordis of the Bloomberg School ... Essentials of Epidemiology in Public Health (4th Edition .. Author: Leon Gordis ... page intentionally left blank A DICTIONARY OF EPIDEMIOLOGY FOURTH EDITION Edite. ... Human Genome Epidemiology, 2nd Edition.. File Type PDF Epidemiology 4th Edition Leon Gordis Teamva ... to Stata for Health Researchers, Fourth EditionEpidemiologic MethodsNovick & Morrow's Public .... I would suggest "Epidemiology" by Leon Gordis and for advanced students: ... It is available free at: http://www.cdc.gov/osels/scientific_edu/ss1978/SS1978.pdf ... Epidemiology, 4th Edition, of Leon Gordis would be my recommendation for the .... Leon gordis epidemiology 4th uploaded by Gordis epidemiology 6th edition ... Epidemiology 5th Edition by Leon Gordis, ISBN-13 978-1455737338 PDF eBook .... Jun 22, 2021 — This item: Epidemiology, 4th Edition 4th Edition by Leon Gordis (2008) ... Gordis Epidemiology [PDF] Download Full - Read Book Page.. May 18, 2013 — Epidemiology 4th Edition PDF Free PDF Download. Leon Gordis introduces the basal account and concepts of epidemiology in clear, abridged .... Read Epidemiology, 4th Edition PDF - by Leon Gordis Saunders This popular book is written by the award-winning teacher, Dr. Leon Gordis of the Bloomberg .... Bookmark File PDF Gordis Epidemiology 4th Edition ... This item: Epidemiology, 4th Edition 4th Edition by Leon Gordis (2008) Paperback by Leon Gordis .... Epidemiology / Leon Gordis.—Fifth edition. p. ; cm. ... A major change in the fourth edition was publication of the book in color. The use of ... Fourth, to evaluate both existing and newly ... http://www.cdc.gov/nchs/data/nvsr/nvsr60/nvsr60_03.pdf.. May 21, 2021 — Environmental epidemiology 4th Edition Leon Gordis, Handbook, to this complex science. 99Download Epidemiology with STUDENT .... Bookmark File PDF Epidemiology 4th Edition. Leon Gordis. Essentials of Nursing ResearchMethods for the. Economic Evaluation of Health Care.. PDF Download Epidemiology 4th Edition 4th Edition by Leon ... — ... teacher, Dr. [Leon Gordis] Epidemiology (4th Edition) (1) .... This item: Epidemiology, 4th Edition 4th Edition by Leon Gordis (2008) Paperback by Leon ... [PDF] Gordis Epidemiology Download Full – PDF Book Download.. This item: Epidemiology, 4th Edition 4th Edition by Leon Gordis (2008) Paperback by Leon Gordis Paperback ... Gordis Epidemiology 4th - Free PDF eBook.. Buy Epidemiology 3rd edition (9781416025306) by Leon Gordis for up to 90% off at Textbooks.com.. Gordis L 2014 Epidemiology 5th ed Philadelphia PA Saunders Epidemiology Fourth Edition Leon Gordis.pdf - Free DownloadGordis L Epidemiology 4th Edition .... Where To Download Gordis Epidemiology 4th. Edition. Gordis Epidemiology 4th ... Epidemiology, by award-winning educator and epidemiologist Leon Gordis, .... EPIDEMIOLOGY BY LEON GORDIS EBAY. EPIDEMIOLOGY 4TH EDITION. BY LEON GORDIS SAYDAK CO. GORDIS EPIDEMIOLOGY 5TH EDITION. PDF .... Leon Gordis, comes the fully revised 6th Edition of Gordis Epidemiology. This bestselling text provides a solid introduction to basic epidemiologic principles as well .... Epidemiology, by award-winning educator and epidemiologist Leon Gordis, ... Edition of the acclaimed Modern Epidemiology reflects both the conceptual devel .. Find Leon Gordis solutions at Chegg.com now. ... Below are Chegg supported textbooks by Leon Gordis. Select a textbook to see ... Epidemiology 4th Edition. Epidemiology Gordis 5th edition, by award-winning educator and epidemiologist Leon Gordis, is a best-selling introduction to this complex science. Dr. Gordis .... Epidemiology 9781455737338 US Elsevier Health Bookshop. Epidemiology 4th Edition 4th Edition by Leon Gordis 2008. Gordis Epidemiology 5th Edition pdf .... Modern Epidemiology Fourth Edition - amazon.com(PDF) A Dictionary of ... (4th Edition Epidemiology, 4th Edition 4th Edition by Leon Gordis (2008 .... 1) Leon Gordis: Epidemiology. 3rd edition, 2004. 2) Articles: In Department of ... Two Definitions of an Epidemic. Last JM: A Dictionary of Epidemiology. 4th ed.. 6th Edition - ElsevierGordis Epidemiology [PDF] Download Full - …Gordis L. Epidemiology 5th Edition Pdf.pdf - …Leon Gordis. Epidemiology 4th Edition .... epidemiology 4th edition leon gordis - Bing Epidemiology, by award-winning educator and epidemiologist Leon Gordis, is a best-selling introduction to this .... 1. PDF Epidemiology, 4th Edition · 2. DESCRIPTION This popular book is written by the award-winning teacher, Dr. · 3. clear, concise writing and his inimitable style .... Jan 10, 2020 — Epidemiology Leon Gordis Lecture Epidemiology, 4th Edition Epidemiological ... Epidemiology 5th Edition by Leon Gordis - PDF Version .. Bookmark File PDF Epidemiology 4th Edition. Leon Gordis. Epidemiology 4th Edition Leon Gordis | c902c4a46e24ce086cd9b80f6672b4f6. Critical Appraisal of .... File Type PDF Gordis L Epidemiology 4th Edition. Gordis L ... Park's Textbook of preventive and social medicine, 21st edition • Textbook of Epidemiology, Leon.. Epidemiology, 4th Edition, book pdf Epidemiology, 4th Edition, Leon Gordis epub Epidemiology, 4th Edition, the book Epidemiology, 4th Edition, Download .... Epidemiology, 4th Edition 4th Edition by Leon Gordis (2008) Paperback Leon Gordis. 4th. Download Epidemiology, 4th Edition 4th Edition by Leon Gord ...pdf.. Where To Download Epidemiology 4th Edition. Leon Gordis. Rheumatic Fever Succinct yet thorough,. Epidemiology, Biostatistics, and Preventive. Medicine, 3rd .... Items Epidemiology, 4th Edition by Leon Gordis. ... Pdf Epub Ebook Online Massey Ferguson Husqvarna Compact Loader Service Manual Shop Zero Turn.. gordis fourth edition aguantevaldivia.cl Read/Download File Report Abuse. Chapter 3 The Occurrence of Disease Fifth Edition. Leon Gordis, MD, MPH, DrPH .... Leon Gordis Epidemiology (4th Edition) (1) - View presentation slides online. Health promotion. PDF Download Epidemiology 4th Edition 4th Edition by Leon .... Edition/Format: Print book : English : 4th edView all editions and formats. Summary: This book is written by the award-winning teacher, Dr. Leon Gordis of the .... Managerial EpidemiologyEnvironmental HealthBasic and Clinical BiostatisticsJekel's Epidemiology, Biostatistics, Preventive Medicine, and Public .... Download Free Epidemiology 4th Edition Leon Gordis ... Changes in infectious and chronic disease epidemiology including vaccines, health promotion, human .... by BB Gerstman · Cited by 1 — Edition/Year: 4th Edition/2015. (3rd edition is also ... Author: Leon Gordis. Publisher: Saunders ... Textbook Title: Chronic Disease Epidemiology and. Control.. READ Epidemiology 4th Edition Leon Gordis PDF Books this is the book you are ... 106 Problems Solved: Leon Gordis: Epidemiology 5th Edition 111 Problems .... Gordis provides a clear, basic introduction to the methods of epidemiology. ... book on epidemiology to more than one school, currently in the fourth edition, .... May 20, 2019 — Manuals and ebooks about gordis epidemiology 4th edition pdf,.How to ... Source #2: epidemiology fourth edition leon gordis.pdf FREE PDF .... FREE BOOK PDF. EPIDEMIOLOGY 5TH EDITION CHEGG COM. EPIDEMIOLOGY BY LEON GORDIS EBOOK ON INKLING. GORDIS L EPIDEMIOLOGY 4TH .... ... and continuing in the tradition of award-winning educator and epidemiologist Dr. Leon Gordis, comes the fully revised 6th Edition of Gordis Epidemiology.. Epidemiology, by award-winning educator and epidemiologist Leon Gordis, is a ... Meta Keywords: Epidemiology 4th Edition PDF, Epidemiology 4th Edition .... ... also include classic literature and books that are obsolete. Epidemiology 4th Edition Leon. Gordis ... (PDF) Leon gordis epidemiology 4th uploaded by | Maya .. Guide PDF files on the internet quickly and easily. Epidemiology Fourth Edition Leon Gordis.pdf -. Free Download. Download Epidemiology, 4th Edition (Leon.. Epidemiology, Edition by Leon Gordis 1416040021 9781416040026 Science ... Dictionary, Edition (Thumb Index Version) ebooks pdf Medical Dictionary,.. 6202018 Read Epidemiology, 4th Edition PDF - by Leon Gordis Saunders This popular book is written by the award-winning teacher, Dr. Leon Gordis of .... Epidemiology By Leon Gordis Pdf Epidemiology Textbook Pdf. Epidemiology 4th Edition 9781416040026 Textbooks Com. Epidemiology Fourth Edition Leon .... The Media Monopoly, The New Communications Cartel, Fifth Edition, 1997, Boston: Beacon Press, ... University, 2003; 1(51):52-114, http://www.law.msu.edu/lawrev/2003-1/2-Saunders.pdf. ... 128 F.3d 233 (4th Circuit, 1997). ... Michael D. Green, D.Mical Freedman & Leon Gordis, “Reference Guide on Epidemiology,” 1056.. Department of Epidemiology Student Handbook introduces you to the ... 2018-2019 edition of the Handbook in planning and following your academic ... During the 4th term of First Year, register for special studies with your ... SPECIAL NOTE – The Leon Gordis Teaching Assistantship has the additional special distinction of.. Download File PDF Epidemiology 4th. Edition Leon Gordis. Epidemiology 4th Edition Leon Gordis. As recognized, adventure as capably as experience virtually .... 6202018 Read Epidemiology, 4th Edition PDF - by Leon Gordis Saunders This popular book is written by the award-winning teacher, Dr. Leon Gordis of .... Download File PDF Epidemiology Gordis. Fourth Edition. Edition 5 by Leon Gordis | Book Review Confounding. Epidemiology Leon Gordis Lecture 1 .... Gordis | downloadEpidemiology - Leon Gordis - Google Books(PDF) Leon gordis epidemiology 4th uploaded by. | Maya Epidemiology E-Book 5th edition .... [Leon Gordis] Epidemiology (4th Edition) (1) - View presentation slides online. Health promotion.. File Type PDF Epidemiology 4th Edition Leon Gordis. Epidemiology 4th Edition Leon Gordis | c902c4a46e24ce086cd9b80f6672b4f6. Introduction to Public .... Humans: Epidemiology and Control, 4th ed. New York, Plenum 1997.) Figure 2-5 shows the spectrum of severity for several diseases. Most cases of tuberculosis .... Epidemiology 4th Edition Leon Gordis | c902c4a46e24ce086cd9b80f6672b4f6. Population Health: Behavioral and Social Science InsightsEpidemiology for .... Gordis Epidemiology 5th Edition pdf Stuvera com. Introduction to epidemiology. 9781416040026 Epidemiology 4th Edition by Leon Gordis. epidemiology .... Leon Gordis (2009). Epidemiology, 4th edition. ISBN 978-1-4160-4002-6. Publisher: Saunders (Elsevier), Philadelphia,. PA. F. Contact. Matthias Lorez, PhD .... Gordis Fourth Edition. Interview of. Gordis Epidemiology 4th -. Free PDF eBook. This popular book is written by the award-winning teacher, Dr. Leon Gordis of.. epidemiology 4th uploaded by | Maya Epidemiology - Leon Gordis on eBay ... Epidemiology 5th Edition by Leon Gordis, ISBN-13: 978-1455737338 [PDF eBook .... Leon Gordis, comes the fully revised 6th Edition of Gordis Epidemiology. This bestselling text provides a solid introduction to basic epidemiologic principles as well .... Read Free Epidemiology 4th Edition Leon Gordis ... for Advanced Nursing PracticeGordis EpidemiologyCommunity & Public Health Nursing: Promoting the .... Epidemiology, 4th Edition by Leon Gordis(2008-05-28): Amazon.de: Bücher Gordis L ... PDF-Download Epidemiology, 4th Edition Full Popular - by Leon Gordis .. Título: epidemiology by leon gordis 612766 valnet pdf. International business, 4th edition. Epidemiology, by award- profitable educator and epidemiologist leon .... 106 Problems Solved: Leon Gordis: Epidemiology 5th Edition 111 Problems Solved: Leon ... Epidemiology Final Exams Questions 4th, 2021Epidemiologia Leon .... Epidemiology (4th Edition) | Leon Gordis | download | Z-Library. Download books for free. Find books.. This popular book is written by the award-winning teacher, Dr. Leon Gordis of the Bloomberg School of Public Health at Johns Hopkins University. He introduces .... Download File PDF Gordis Epidemiology 4th Edition. Gordis Epidemiology 4th ... medicine, 21st edition • Textbook of Epidemiology, Leon Gordis, 4th edition.. Accessed May 30, 2019. https://www.govinfo.gov/content/pkg/PLAW-113publ283/pdf/PLAW-113publ283.pdf. ... Gordis, Leon. 2008. Epidemiology,4th Edition.. Description. Author: Leon Gordis. Brand: True Fabrication. Edition: 4th. Features: Used Book in Good Condition. Format: Other Calendar. ISBN: 9781416040026.. Jan 12, 2017 — With its focus of study in human populations, epidemiology is directly linked with public ... Epidemiology, 4th edition, Gordis (2009), Elsevier/Saunders ... https://nciph.sph.unc.edu/focus/vol1/issue5/1-5EpiCurves_issue.pdf.. Gordis Epidemiology 4th Edition | 707315bff50bc64f5bda24d92d3901ab ... Studies | PSM Made EasyLeadership in Organizations 8th Edition - amazon.com(PDF) ... medicine, 21st edition • Textbook of Epidemiology, Leon Gordis, 4th edition.. Download File PDF Gordis Epidemiology 4th. Edition ... This item: Epidemiology, 4th Edition 4th Edition by Leon Gordis. (2008) Paperback by Leon Gordis .... Read Now http://readebookonline.com.pdf4share.info/?book=B011DBHSQSPDF Download Epidemiology 4th Edition 4th Edition by Leon Gordis 2008 .... Epidemiology 4th Edition PDF Free Download E-BOOK DESCRIPTION Epidemiology , by award-winning educator and epidemiologist Leon Gordis, is a .... Jul 5, 2021 — PDF Download written by Leon Gordis, Title: Epidemiology, 4th Edition. This popular book is written by the award-winning teacher, Dr. Leon .... Bookmark File PDF Epidemiology Fourth Edition Leon Gordis ... This item: Epidemiology, 4th Edition 4th Edition by Leon Gordis (2008) Paperback by Leon .... EPUB Download Free Epidemiology, 4th Edition >> https://librarywebfree.blogspot.com/book53.php?asin=1416040021.. epidemiology-fourth-edition-leon-gordis 1/2 Downloaded from evwg.laoef.site on Novem by guest Download Epidemiology Fourth Edition Leon Gordis If you ally .... 1 / 466 Gordis: Epidemiology, 4th ed. Copyright © 2008 Saunders, An Imprint of Elsevier EPIDEMIOLOGY Fourth Edition LEON GORDIS, MD, MPH, DrPH .... Bookmark File PDF Gordis L Epidemiology 4th. Edition. EpidemiologyChronic Disease Epidemiology and. ControlPark's Textbook of Preventive and Social.. This item: Epidemiology, 4th Edition 4th Edition by Leon Gordis (2008) Paperback by Leon Gordis Paperback ... Gordis Epidemiology 4th - Free PDF eBook.. epidemiologic approach to disease and ... Download Epidemiology - 4th. Edition Online Free - pdf ... Epidemiology Leon Gordis Pdf.pdf -. Free download Ebook .... Download File PDF Leon Gordis Epidemiology 4th Edition 2009. Leon Gordis Epidemiology 4th Edition 2009. Right here, we have countless ebook leon gordis .... Gordis Epidemiology 4th - Free PDF eBookEpidemiology Gordis Fourth Edition - app.savvi.com(PDF). Leon gordis epidemiology 4th uploaded by | Maya .... Download File PDF Gordis. Epidemiology 4th Edition. Deal, PhD, and PhD student. Heather McKay Discuss. \"Epidemiology\". Epidemiology Leon Gordis.. Gordis Epidemiology 4th - Free PDF eBook epidemiology gordis fourth edition This item: Epidemiology, 4th Edition 4th Edition by Leon Gordis (2008) Paperback .... Epidemiology - Gordis, Leon | 8580001439969 | Amazon.com (PDF) Leon gordis epidemiology 4th uploaded by | Maya Record Citations - University of Kansas .... Epidemiology Gordis Fourth Edition - b55565650473d53c40e8. Gordis, Leon's Epidemiology, 4th Edition (Gordis ... (PDF) Leon gordis epidemiology 4th .... EPIDEMIOLOGY BY LEON Gordis 5th edition PDF (Student Consult NOT included) - $8.99. FOR SALE! This is a digital textbook.There will be NO actual book to .... L. Gordis, Fourth ed, 2009, SaundersGordis Epidemiology, 6th Edition - Elsevier. HealthGordis Epidemiology 4th - Free PDF eBookEpidemiology E-Book - Leon .... Gordis Epidemiology 4th Edition | 707315bff50bc64f5bda24d92d3901ab ... This popular book is written by the award-winning teacher, Dr. Leon Gordis of the .... Leon Gordis. Saunders ... 978-1449604691 Epidemiology: Beyond the Basics 3rd Edition ... 978-0256117363 Applied Linear Statistical Models 4th edition.. tions, the fourth edition discusses key epidemiologic concepts and basic methods in more ... Helen Abbey, James Tonascia, Leon Gordis, and Mary Meyer.. Epidemiology, by award-winning educator and epidemiologist Leon Gordis, is a ... Meta Keywords: Epidemiology 4th Edition PDF, Epidemiology 4th Edition .... by L GORDIS · Cited by 4 — EPIDEMIOLOGY Fourth Edition. LEON GORDIS, MD, MPH, DrPH. Professor of Epidemiology. Johns Hopkins Bloomberg School of Public Health. Professor of ... 3e88dbd8be
cassiriogas54306tc
Comments