TY - JOUR AU - Hasegawa, J. AU - Sekizawa, A. AU - Ikeda, T. AU - Koresawa, M. AU - Ishiwata, I. AU - Kawabata, M. AU - Kinoshita, K. PY - 2015 DA - 2015// TI - The use of balloons for uterine cervical ripening is associated with an increased risk of umbilical cord prolapse: population based questionnaire survey in Japan JO - BMC Pregnancy Childbirth VL - 15 UR - https://doi.org/10.1186/s12884-015-0432-4 DO - 10.1186/s12884-015-0432-4 ID - Hasegawa2015 ER -