[1] Univ Catholique Louvain, Ind Toxicol & Occupat Med Unit, Brussels, Belgium
[2] Univ Catholique Louvain, Epidemiol Unit, Brussels, Belgium
[3] Univ Catholique Louvain, Dept Gynaecol, Brussels, Belgium
[4] Clin Univ St Luc, B-1200 Brussels, Belgium