TY - EJOUR T1 - Combined use of amnioscopy and amniocentesis in the surveillance of twin pregnancy AU - Saling, Erich PY - 1974 LA - eng PB - Kooperation de Gruyter JO - Journal of Perinatal Medicine - Official Journal of the WAPM DO - 10.1515/jpme.1974.2.1.69 ER -