Principled Subpopulation Analysis of the BetterBirth Study and the Impact of WHO's Safe Childbirth Checklist Intervention. - Girmaw Abebe Tadesse; Megan Marx Delaney; Victor Akinwande; William Ogallo; Claire-Helene Mershon; Katherine Semrau; Skyler Speakman (AMIA, 2022)