Okamoto, E. .; Demizugawa, M. .; Otsuki , Y.; Takagi, T. .; Mitsuda, N. .; Tanizawa , O. Study of Immunoreactive 8-Arginine Vasopressin in Human Plasma During Pregnancy and at Delivery : Utilization of a Highly Sensitive Radioimmunoassay With a Reversed Phase C18 Silica Column. Thai J Obstet Gynaecol 1992, 4, 89-98.