In the Op-Ed by Grimes in the March issue of wjm, the correct reference citations for references 10 through 13 are:
10 IMAP statement of emergency contraception. IPPF Medical Bulletin 1994;6:1-2.
11 Piaggio G, von Hertzen H, Grimes DA, et al. Timing of emergency contraception with levonorgestrel or the Yuzpe regimen. Lancet 1999;353:721. (Task Force on Postovulatory Methods of Fertility Regulation.)
12 Cates W, Jr, Raymond EG. Emergency contraception—parsimony and prevention in the medicine cabinet. Am J Public Health 1997;87:909-910.
13 Glasier A, Baird D. The effects of self-administering emergency contraception. N Engl J Med 1998;339:1-4.