Participants were enrolled beginning in February 2005. IRB approval was in place at New York Downtown Hospital, Manhattan, NY, from inception until March 2013, when it ceased to be a study site. During the study period at Downtown Hospital, 3 participants overall were enrolled and studied. St. Luke's Roosevelt Hospital Center, Manhattan, NY, became a study site when it received IRB approval in January 2010 and at present is the only study site, and has continuing IRB approval. While under IRB approval, 5 patients have been enrolled and studied at St. Luke's and Roosevelt. Each participant has given written informed consent. To date, 53 women have been recruited overall, and 8 have given informed consent and been studied.