title: The validation of the Billings ovulation method by laboratory research and field trials.
authors.affiliation: WOOMB International, Faculty of Medicine, Melbourne, Australia.
authors.forename: J J
authors.initials: JJ
authors.lastname: Billings
mesh_terms: D005260:Female; D005298:Fertility; D005640:Follicle Stimulating Hormone / Q000097:blood; D006801:Humans; D007247:Infertility, Female / Q000175:diagnosis; D007986:Luteinizing Hormone / Q000097:blood; D008597:Menstrual Cycle; D008991:Monitoring, Physiologic; D010061:Ovulation Detection / Q000379:methods*
chemical_list: D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone