Contraceptive efficacy of emergency contraception with levonorgestrel given before or after ovulation☆
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☆ This study has been supported by grants 1060252 and FB0807 from Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT) and by grant A 65559 from the World Health Organization, Department of Reproductive Health and Research (WHO/RHR).
PII: S0010-7824(09)00541-1
doi:10.1016/j.contraception.2009.12.015
© 2010 Elsevier Inc. All rights reserved.
