The association of epidural anesthesia with cesarean section in low risk women: E. Liebermanx, A. Cohenx, JM. Langx, R. D'Angostino, Jrx, S. Dattax, FD Frigoletto, Jr. Depts. Ob/Gyn and Anesthesia, Brigham and Women's Hospital, Dept. Ob/Gyn, Massachusetts General Hospital, Dept. Epidemiology/Biostatistics, Boston Univ. School of Public Health, Boston, MA; Public Health Sciences, Bowman Gray Medical School, Winston Salem, NC