title: [A 3-step-natural childbirth: for safer childbirth controlled by the patient].
authors: H
authors: H
authors: Nezu
authors: Y
authors: Y
authors: Ayuzawa
authors: M
authors: M
authors: Hama
authors: Y
authors: Y
authors: Komatsu
authors: Y
authors: Y
authors: Takenaka
mesh_terms: D005260:Female; D006801:Humans; D009321:Natural Childbirth / Q000379:methods*; D010358:Patient Participation; D011247:Pregnancy