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Risk of pregnancy and external validity in clinical trials of emergency contraception
- Correspondence to Dr Kelly Blanchard, Ibis Reproductive Health, 2 Brattle Square, Cambridge, MA 02138–3742, USA. Tel: +1 617 349 0040. Fax: +1 617 349 0041. E-mail: kblanchard{at}ibisreproductivehealth.org
Citation
Risk of pregnancy and external validity in clinical trials of emergency contraception
Publication history
- Accepted February 24, 2006
- First published July 1, 2006.
Online issue publication
April 23, 2017
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