TY - JOUR AN - 11 TI - ACOG Practice Bulletin #56. Multiple gestation: complicated twin, triplet, and high-order multifetal pregnancy. JO - Obstet Gynecol PY - 2004 VL - 104 SP - 869-883 M2 - 869 DO - 10.1097/00006250-200410000-00046 ER -