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Differences in reporting Pearl Indices in the United States and Europe: Focus on a 91-day extended-regimen combined oral contraceptive with low-dose ethinyl estradiol supplementation.
Lobo Abascal P, Luzar-Stiffler V, Giljanovic S, Howard B, Weiss H, Trussell J. Lobo Abascal P, et al. Among authors: luzar stiffler v. Eur J Contracept Reprod Health Care. 2016;21(1):88-91. doi: 10.3109/13625187.2015.1059416. Epub 2015 Jun 26. Eur J Contracept Reprod Health Care. 2016. PMID: 26115381 Free PMC article.