Impact of a long-term mentorship program for childbirth providers on quality of care: A cluster randomized controlled trial - Lujia Zhang; Rajet Vatsa; Wei Chang; Sharon Akinyi; Sarah Little; Catherine Gakii; John Mungai; Cynthia Kahumbura; Sathyanath Rajasekharan; Anneka Wickramanayake; Margaret McConnell; Jessica Cohen (PLOS Global Public Health, 2026)