Timing clinic visits to phases of the menstrual cycle by using a fertility monitor: the BioCycle Study.
Howards PP; Schisterman EF; Wactawski-Wende J; Reschke JE; Frazer AA; Hovey KM; American Journal of Epidemiology, 2009, vol. 169, issue 1, p 105, ISSN 00029262. ISBN 00029262.

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