B. Chanrachakul, U. Siriwattanachoke, and W. Phuapradit, “Attitude of pregnant women attending Ramathibodi Hospital toward the ‘Ramathibodi Placental Utilization Project (Rama PUP)’”, Thai J Obstet Gynaecol, vol. 13, no. 3, pp. 75–78, Apr. 2001.