Lu H F, Sheu B C, Shih J C, Chang Y L, Torng P L, Huang S C
Department of Obstetrics and Gynecology, College of Medicine, National Taiwan University Hospital, Taipei, Taiwan.
Acta Obstet Gynecol Scand. 1997 Oct;76(9):886-9. doi: 10.3109/00016349709024372.