Natural family planning in today's world.
D019411:Clinical Laboratory Techniques; D003933:Diagnosis; D005193:Family Planning Services; D010061:Ovulation Detection; D012106:Research; D012107:Research Design
Examinations And Diagnoses; Family Planning; Family Planning, Behavioral Methods; Laboratory Examinations And Diagnoses; Laboratory Procedures; Measurement; Natural Family Planning--beneficial effects; Ovulation Detection; Research Methodology