Some methodological considerations of a progestin-only oral contraceptive study from a programmatic perspective
Advances in contraception : the official journal of the Society for the Advancement of Contraception（1993）
Abstract
Among the limited number of reports on progestin-oral contraceptives (POCs), noncomparative studies conducted at family planning clinics have been the most often reported. This research trend will probably continue.
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Key words
Family Planning, Practical Issue, Methodological Consideration, Research Trend, Parmi
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