Skip to main content
. 2016 Dec 14;11(12):e0167709. doi: 10.1371/journal.pone.0167709

Fig 1. Stages of progress of the inception cohort.

Fig 1

IRB = institutional review board. The end-of-trial form was missing of 186 of the 574 (32%) trials that were included in the analysis. Principal investigators of 73 of these trials responded to our questionnaire, completing the information on the end-of-trial. From the remaining 113, of 87 trials we found other documents than the end-of-trial form indicating that the trial had started (for example, emails from the IRB or amendments), or we found that the trial was published.