Risk of pregnancy and external validity in clinical trials of emergency contraception.

Westley, E; Bigrigg, A; Webb, A; Haskell, S; Blanchard, K; Loftus-Granberg, B; Sorhaindo, A; Johnston, K; Spiers, A; Abuabara, K; +1 more... Ellertson, C; (2006) Risk of pregnancy and external validity in clinical trials of emergency contraception. The journal of family planning and reproductive health care / Faculty of Family Planning & Reproductive Health Care, Royal College of Obstetricians & Gynaecologists, 32 (3). pp. 165-9. ISSN 1471-1893 DOI: https://doi.org/10.1783/147118906777888305

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