Search Results       Your search for [subject]CONTRACEPTIVE USE-EFFECTIVENESS returned 1 record.           Trials of the ovulation method of natural family planning. Subject: OVULATION DETECTION; NATURAL FAMILY PLANNING METHODS; FAMILY PLANNING SERVICES; CONTRACEPTION; OVULATION DETECTION, CERVICAL MUCUS METHOD; RHYTHM METHOD OF FAMILY PLANNING, CALENDAR; NATURAL FAMILY PLANNING; CONTRACEPTIVE USE-EFFECTIVENESS; FAMILY PLANNING EDUCATION; SOCIOECONOMIC FACTORS; DEVELOPED COUNTRIES; DEVELOPING COUNTRIES; FAMILY PLANNING; CONTRACEPTIVE EFFECTIVENESS.          Add to Book Cart Relevance: 19.91%