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There is no paradox with PPI in research

 

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Online download statistics by month: January 2013 to August 2021

AbstractFullPdf
Jan 20130820
Feb 20130920
Mar 2013089
Apr 20130210
May 20130512
Jun 20132545
Jul 20135234
Aug 20133014
Sep 2013924
Oct 20132559
Nov 20131953
Dec 20132924
Jan 201429117
Feb 20141266
Mar 20142297
Apr 20142355
May 20142611
Jun 20141405
Jul 20141812
Aug 20142158
Sep 20142612
Oct 20143137
Nov 20142720
Dec 20141502
Jan 20152615
Feb 20152918
Mar 20153026
Apr 20153306
May 20152403
Jun 20152824
Jul 20151900
Aug 20154225
Sep 20152642
Oct 20151503
Nov 20152324
Dec 20152200
Jan 20163237
Feb 20162348
Mar 20161516
Apr 20162112
May 20162311
Jun 20163915
Jul 20161655
Aug 20162001
Sep 20162366
Oct 20162818
Nov 20162345
Dec 20161943
Jan 20172723
Feb 20173521
Mar 20171832
Apr 20172643
May 201734198
Jun 2017331010
Jul 20172762
Aug 20174582
Sep 20175331
Oct 2017861613
Nov 201798177
Dec 20178793
Jan 20187453
Feb 20186753
Mar 20188381
Apr 20185442
May 20186722
Jun 20186194
Jul 20187263
Aug 20186043
Sep 20182444
Oct 20184998
Nov 20186677
Dec 20183912
Jan 20194451
Feb 20194247
Mar 2019821111
Apr 20194116
May 20193022
Jun 20196055
Jul 20194233
Aug 20195576
Sep 20192713
Oct 20192531
Nov 20193920
Dec 20197442
Jan 20203441
Feb 20202642
Mar 20203620
Apr 20201422
May 20202536
Jun 2020103113
Jul 20204232
Aug 20204610
Sep 20207643
Oct 20203821
Nov 20203412
Dec 20206053
Jan 20215012
Feb 202191517
Mar 20216472
Apr 20218997
May 20214477
Jun 2021634
Jul 20211130
Aug 20211033
Total3797424480

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