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Observational research methods. Research design II: cohort, cross sectional, and case-control studies
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Mar 20031334240
Apr 2003227428
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Aug 200311238
Sep 2003123924
Oct 2003235140
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Jan 200861759214
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Apr 201232128571329
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Dec 201267715742088
Jan 2013100717422542
Feb 201387318502860
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Apr 201391225023595
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Jun 201344319443083
Jul 201338819922354
Aug 201350318532454
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Oct 201364921784272
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Dec 201343915263049
Jan 201458120702992
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Dec 20157021657782
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Jul 201713167832745
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Dec 2017307417853536
Jan 2018340519664210
Feb 2018396223143457
Mar 2018586436253278
Apr 2018644144224086
May 2018502034743485
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Jul 2018266916322695
Aug 2018389427733055
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Oct 2018648347734184
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Dec 2018486236063288
Jan 2019542441283676
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Apr 2019749057014703
May 2019758661064584
Jun 2019561247053539
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Aug 2019716158934114
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May 2021289024063901
Jun 2021163816203629
Jul 2021199319973406
Aug 2021574457503581
Sep 2021834883364039
Total343705492545364856