title: Natural contraceptive methods.
authors.affiliation: Clinica Ostetrica e Ginecologica, Università di Firenze.
authors.forename: V
authors.initials: V
authors.lastname: Bruni
authors.forename: R
authors.initials: R
authors.lastname: Perini
authors.forename: R
authors.initials: R
authors.lastname: Cirri
authors.forename: E
authors.initials: E
authors.lastname: Degl'Innocenti
authors.forename: C
authors.initials: C
authors.lastname: Michelozzi
authors.forename: A
authors.initials: A
authors.lastname: Verni
mesh_terms: D000293:Adolescent; D003267:Contraception / Q000379:methods*; D005260:Female; D005298:Fertility; D006801:Humans; D008297:Male; D008572:Menarche; D008597:Menstrual Cycle