Abstract
Department of SocialMedicine, Ribeir~ao Preto Medical School, University of S ~ao Paulo, Ribeir ~ao Preto, SP, BrazilCorrespondence: O Tunc€ alp, HRP—UNDP/UNFPA/UNICEF/WHO/World Bank Special Programme of Research, Development and ResearchTraining in Human Reproduction, Department of Reproductive Health and Research, World Health Organization, 20 Avenue Appia, Geneva,Switzerland. Email tuncalpo@who.intAccepted 11 March 2014.
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