A Prospective Cohort Study of Menstrual Characteristics and Time to Pregnancy.
Wise, Lauren A.; Mikkelsen, Ellen M.; Rothman, Kenneth J.; Riis, Anders H.; Sorensen, Henrik Toft; Huybrechts, Krista F.; Hatch, Elizabeth E.; American Journal of Epidemiology, 2011, vol. 174, issue 6, p 701, ISSN 00029262. ISBN 00029262.

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