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