This guideline was coordinated by Dr Luz Maria De-Regil under the supervision of Dr Juan Pablo Peña-Rosas, with technical input from Dr Metin Gulmezoglu, Dr Jose Martines, Dr Matthews Mathai and Dr Lisa Rogers. Thanks are due to Dr Regina Kulier and the staff at the Guidelines Review Committee Secretariat for their support throughout the process. Thanks to also due to Dr Davina Ghersi for her technical advice and assistance in the preparation of the technical consultations for this guideline and Mr Issa T. Matta and Mrs Chantal Streijffert Garon from the World Health Organization (WHO) Office of the Legal Counsel for their support in the management of conflicts of interest procedures. Ms Grace Rob and Mrs Paule Pillard from the Micronutrients Unit, Department of Nutrition for Health and Development, provided logistic support.

WHO gratefully acknowledges the technical input of the WHO Nutrition Steering Committee and the Nutrition Guidance Expert Advisory Group (NUGAG), especially the chairs of the meetings, Dr Janet King, Dr Rebecca Stoltzfus and Dr Rafael Flores-Ayala. WHO is also grateful to the Cochrane Developmental, Psychosocial and Learning Problems Group staff for their support during the development of the systematic review used to inform this guideline.