[1] Radboud Univ Nijmegen, Dept Obstet & Gynecol, Med Ctr, Nijmegen, Netherlands
[2] Haukeland Hosp, Mohn Med Imaging & Visualizat Ctr, Dept Radiol, Bergen, Norway
[3] Radboud Univ Nijmegen, Dept Radiat Oncol, Med Ctr, Nijmegen, Netherlands
[4] Open Univ Netherlands, Fac Sci, Heerlen, Netherlands