Bacon Janice, Francoeur Diane, Goldfarb Alvin F, Breech Lesley L
Department of Obstetrics & Gynecology, University of South Carolina, Columbia, South Carolina 29203, USA.
J Pediatr Adolesc Gynecol. 2003 Jun;16(3):157-66. doi: 10.1016/s1083-3188(03)00045-7.