title: Observations on the use of a modified Grafenberg ring for contraception: a prelininary report.
authors.forename: T D
authors.initials: TD
authors.lastname: SPRITZER
mesh_terms: D003267:Contraception; D003270:Contraceptive Agents; D006801:Humans; D010570:Pessaries
chemical_list: D003270:Contraceptive Agents
keywords: CONTRACEPTIVES; PESSARIES