Massuger L F, Claessens R A, Pak K Y, Boerman O C, Daddona P E, Koenders E B, Kenemans P, Corstens F H
Department of Obstetrics and Gynecology, University Hospital Nijmegen, The Netherlands.
Int J Rad Appl Instrum B. 1991;18(1):77-83. doi: 10.1016/0883-2897(91)90051-l.