Integrating an early childhood development programme into Bangladeshi primary health-care services: an open-label, cluster-randomised controlled trial oleh Jena D Hamadani, PhD, Syeda F Mehrin, MSc, Fahmida Tofail, PhD, Mohammad I Hasan, MPH, Syed N Huda, PhD, Helen Baker-Henningham, ProfPhD, Deborah Ridout, MSc, Sally Grantham-McGregor, ProfFRCP