Berk David R, Bayliss Susan J, Merritt Diane F
Department of Internal Medicine, Division of Dermatology, Washington University School of Medicine and St. Louis Children's Hospital, St. Louis, Missouri 63110, USA.
J Pediatr Adolesc Gynecol. 2007 Apr;20(2):105-8. doi: 10.1016/j.jpag.2007.01.002.