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The effect of a direct payment or a lottery on questionnaire response rates: a randomised controlled trial

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Oct 20030114
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Jan 200402311
Feb 2004075
Mar 20040144
Apr 20040268
May 20040127
Jun 200401915
Jul 20040192
Aug 20044154
Sep 20040123
Oct 200414104
Nov 20048158
Dec 20047176
Jan 200512101
Feb 20054128
Mar 20059282
Apr 2005494
May 2005844
Jun 200512126
Jul 20053120
Aug 2005455
Sep 200512115
Oct 20054115
Nov 20053162
Dec 20055108
Jan 2006041
Feb 2006363
Mar 20060164
Apr 20067105
May 2006485
Jun 20061296
Jul 20065114
Aug 2006576
Sep 20064135
Oct 200631110
Nov 2006101614
Dec 2006267
Jan 20071104
Feb 20073143
Mar 20072168
Apr 200751713
May 200731611
Jun 20078186
Jul 20073144
Aug 200722110
Sep 20077175
Oct 20071156
Nov 20074263
Dec 20074100
Jan 200801314
Feb 20081278
Mar 200832116
Apr 2008499
May 2008674
Jun 200815305
Jul 2008196
Aug 20081136
Sep 20081106
Oct 20089327
Nov 2008191
Dec 20082124
Jan 2009054
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Mar 20093218
Apr 20092109
May 2009094
Jun 2009257
Jul 20090115
Aug 20094155
Sep 20091135
Oct 2009170
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Aug 2011810
Sep 20111500
Oct 2011521
Nov 20111243
Dec 20111384
Jan 20124103
Feb 2012222
Mar 2012875
Apr 201210138
May 20126156
Jun 2012894
Jul 2012785
Aug 2012758
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Nov 2012041
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Jan 20130134
Feb 2013074
Mar 20130179
Apr 20130189
May 201301313
Jun 2013644
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Aug 2013418
Sep 2013779
Oct 2013655
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Dec 2013459
Jan 2014854
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Mar 20141190
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Jun 2014273
Jul 201415123
Aug 2014343
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Oct 2014672
Nov 2014012
Dec 2014373
Jan 2015271
Feb 2015048
Mar 2015980
Apr 2015451
May 20151134
Jun 2015401
Jul 2015131
Aug 2015361
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Oct 2015100
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Feb 2016141
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Aug 20164121
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Nov 201618116
Dec 20161011
Jan 2017594
Feb 2017241
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May 20171143
Jun 20173112
Jul 2017550
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Sep 201727153
Oct 201720107
Nov 201733232
Dec 201714102
Jan 201826201
Feb 201819122
Mar 201818142
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May 201828200
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Jul 201818144
Aug 2018443
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Oct 20181175
Nov 201815152
Dec 20181193
Jan 2019863
Feb 20191393
Mar 201915137
Apr 20191163
May 2019662
Jun 2019771
Jul 20191189
Aug 2019995
Total10612123959