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Article History

Received: 29 March 2017

Accepted: 14 August 2017

First Online: 23 August 2017

Ethics approval and consent to participate

: Ethical approvals from the following institutions were obtained: Ethics Review Committee, World Health Organization; Ethics Review Committee, Parc Sanitari Sant Joan de Déu, Barcelona, Spain; Ethics Review Committee, La Princesa University Hospital, Madrid, Spain; Bioethical Committee, Jagiellonian University, Krakow, Poland; Ethics Review Committee, National Public Health Institute, Helsinki, Finland; Ethical Committee, Ghana Medical School, Accra, Ghana; Ethics Committee, School of Preventive and Social Medicine, Russian Academy of Medical Sciences, Moscow, Russia; Ethics Committee, Shanghai Municipal Centre for Disease Control and Prevention, Shanghai, China; Institutional Review Board, International Institute of Population Sciences, Mumbai, India; Research Ethics Committee, Human Sciences Research Council, Pretoria, South Africa; and Ethics Committee, National Institute of Public Health, Cuernavaca, Mexico. Written informed consent from each participant was also obtained.

: Not applicable.

: The authors declare that they have no competing interests. The views expressed in this paper are those of the authors and do not necessarily represent the views or policies of the World Health Organization.

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