- Correspondence to Professor José Villar, Nuffield Department of Women’s & Reproductive Health, University of Oxford, Oxford OX3 9DU, UK;
- Received February 19, 2018
- Revised June 14, 2018
- Accepted June 29, 2018
- First published July 21, 2018.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.