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Papers

Impact of covert duplicate publication on meta-analysis: a case study

BMJ 1997; 315 doi: https://doi.org/10.1136/bmj.315.7109.635 (Published 13 September 1997) Cite this as: BMJ 1997;315:635

Article usage

Article metrics provide readers and authors with an indication of how often a specific article has been accessed month by month. It counts three formats - abstract/extract, full text and pdf. The page is updated each day.

Usage statistics: July 2003 to February 2020

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AbstractFullPdf
Jul 200319600
Aug 200318520
Sep 200318890
Oct 200331900
Nov 2003191350
Dec 2003211150
Jan 200431870
Feb 200420840
Mar 2004281040
Apr 200430920
May 2004221390
Jun 2004181310
Jul 2004541790
Aug 2004181500
Sep 2004291200
Oct 20048750
Nov 200418901
Dec 200436710
Jan 2005311100
Feb 200539920
Mar 200533880
Apr 200520830
May 200527640
Jun 200516620
Jul 200532690
Aug 200514620
Sep 200532850
Oct 2005201390
Nov 200518800
Dec 200523770
Jan 2006401630
Feb 2006231090
Mar 200613990
Apr 200622820
May 200617600
Jun 2006102840
Jul 200619800
Aug 200632800
Sep 200616430
Oct 2006391020
Nov 200623620
Dec 200616600
Jan 200722550
Feb 200724490
Mar 200713640
Apr 200712440
May 200710660
Jun 200713410
Jul 200714610
Aug 200714470
Sep 200722550
Oct 200722610
Nov 200721470
Dec 200715360
Jan 200821530
Feb 200818420
Mar 200826630
Apr 200823620
May 200817660
Jun 2008243100
Jul 200819830
Aug 200816580
Sep 200815870
Oct 200819700
Nov 200815680
Dec 200811450
Jan 200915380
Feb 200917690
Mar 200939610
Apr 200927340
May 200920410
Jun 2009219350
Jul 200931490
Aug 200925420
Sep 200931370
Oct 200927600
Nov 200939610
Dec 200956850
Jan 201029480
Feb 201019380
Mar 201032450
Apr 201034510
May 201035480
Jun 201037350
Jul 201021680
Aug 201023710
Sep 201021380
Oct 201048420
Nov 201031390
Dec 201018290
Jan 201163940
Feb 201141420
Mar 201140500
Apr 201123510
May 201132260
Jun 201179330
Jul 2011180330
Aug 2011167230
Sep 2011199270
Oct 2011204320
Nov 201174400
Dec 20110670
Jan 20120610
Feb 20120820
Mar 20120690
Apr 20121790
May 201226500
Jun 201218550
Jul 20124510
Aug 201219450
Sep 20125580
Oct 20120920
Nov 201201180
Dec 20120510
Jan 20130570
Feb 20131510
Mar 20130600
Apr 20131810
May 20131880
Jun 20131920
Jul 20131940
Aug 201331100
Sep 20136880
Oct 201331200
Nov 201381180
Dec 20132690
Jan 201411080
Feb 201401130
Mar 201401110
Apr 201401740
May 201421100
Jun 20142880
Jul 20140780
Aug 201401510
Sep 20140550
Oct 20143340
Nov 20140520
Dec 20144850
Jan 20152900
Feb 20153620
Mar 201510722
Apr 20153880
May 20153910
Jun 20153580
Jul 20153778
Aug 20156617
Sep 20151490
Oct 20156480
Nov 20152600
Dec 20155660
Jan 20166540
Feb 201679924
Mar 201668116
Apr 201666513
May 2016313412
Jun 2016310512
Jul 2016423614
Aug 2016311311
Sep 201648717
Oct 2016611722
Nov 2016412211
Dec 2016416457
Jan 201711075
Feb 201701390
Mar 201711490
Apr 201711190
May 201711340
Jun 20170580
Jul 20170580
Aug 20170840
Sep 20170870
Oct 20170900
Nov 20170830
Dec 20170980
Jan 201801050
Feb 20180820
Mar 20183600
Apr 20180690
May 20182940
Jun 20180810
Jul 20185720
Aug 20181500
Sep 20183820
Oct 201851400
Nov 201861130
Dec 201831260
Jan 201921170
Feb 201911040
Mar 20193870
Apr 20192790
May 20198660
Jun 20191920
Jul 20191960
Aug 201943370
Sep 201942880
Oct 201901270
Nov 201941320
Dec 20191490
Jan 20202820
Feb 20202680
Total380916414232