Human resources and curricula content for early child development implementation: multicountry mixed methods evaluation - Kohli-lynch, Maya; Hardy, Victoria Ponce; Salazar, Raquel Bernal; Bhopal, Sunil S; Brentani, Alexandra Valéria Maria; Cavallera, Vanessa; Goh, Esther; Hamadani, Jena D; Hughes, Rob; Manji, Karim (Bmj open, 2020)