[1] Sint Lucas Ziekenhuis, Dept Obstet & Gynecol, Ghent, Belgium
[2] Sint Lucas Ziekenhuis, Dept Radiol, Ghent, Belgium
[3] Sint Lucas Ziekenhuis, Dept Gastroenterol, Ghent, Belgium
[4] Ziekenhuis Oost Limburg, Dept Obstet & Gynecol, Genk, Belgium
[5] Univ Hasselt, Dept Physiol, Diepenbeek, Belgium