[Clinical investigation of low dose levonorgestrel releasing vaginal ring].
Gao
J
J
D003267:Contraception; D003268:Contraception Behavior; D003274:Contraceptive Devices, Female; D004194:Disease; D005069:Evaluation Studies as Topic; D005193:Family Planning Services; D006470:Hemorrhage; D010146:Pain; D012816:Signs and Symptoms
Bleeding; Contraception; Contraception Continuation; Contraception Termination; Contraceptive Effectiveness; Contraceptive Methods; Contraceptive Usage; Diseases; Family Planning; Pain; Signs And Symptoms; Use-effectiveness; Vaginal Rings