THE INITIATION OF LABOR AND ITS HORMONAL CONTROL. OXYTOCIC ACTION OF 17-BETA-ESTRADIOL AND THE INHIBITORY EFFECT OF PROGESTERONE
LA INICIACI'ON DEL TRABAJO DE PARTO Y SU CONTROL HORMONAL ACCI'ON OCIT'OCICA DEL 17-BETA ESTRADIOL Y EFECTO INHIBIDOR DE LA PROGESTERONA