Abstract
Supplementary Material 1:
Supplementary File 1: Completed PRISMA Reporting Checklist
Supplementary File 2: Search String
Supplementary File 3: Modifications to the prespecified methods
Supplementary File 4: BCT codebook for the TOPCHILD Collaboration
Supplementary File 5: Study characteristics
Supplementary File 6: Comprehensive summary of delivery features
Supplementary File 7: Comprehensive summary of BCTs
Supplementary File 8: Sensitivity analyses