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Keywords
Adult, Cervix Mucus, Female, Follow-Up Studies, Humans, Natural Family Planning Methods, Pregnancy, Prospective Studies, Cervical Mucus Method, Coitus, Data Aggregation, Demographic Factors, Family Planning, Family Planning, Behavioral Methods, Fertility, Fertility Measurements, Menstrual Cycle, Menstruation, Natural Family Planning, Parity, Population, Population Dynamics, Pregnancy Rate, Reproduction, Research Methodology