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Payment in challenge studies from an economics perspective

 

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AbstractFullPdf
Oct 202013913916
Nov 202047947689
Dec 202026425540
Jan 202117315922
Feb 2021747112
Mar 2021655721
Apr 2021494519
May 2021453711
Jun 2021464115
Jul 2021434013
Aug 2021332812
Sep 2021493814
Oct 2021504028
Nov 2021262228
Dec 202130289
Jan 2022282615
Feb 2022382313
Mar 202247375
Apr 2022412611
Total17191588393