Исследование, о котором идет речь в статье "Natural Family Planning Method As Effective As Contraceptive Pill, New Research Finds"

ScienceDaily (Feb. 21, 2007) — Researchers have found that a method of natural family planning that uses two indicators to identify the fertile phase in a woman's menstrual cycle is as effective as the contraceptive pill for avoiding unplanned pregnancies if used correctly, according to a report published online in Europe's leading reproductive medicine journal Human Reproduction today (21 February). [1]