Affiliation: | (1) Department of Epidemiology, Maastricht University, P.O. Box 616, 6200 Maastricht, MD, The Netherlands;(2) Midwifery care, Meerssen, The Netherlands;(3) Department of Integrated Care, University Hospital Maastricht, Maastricht, The Netherlands;(4) Department of Gynaecology, University Hospital Maastricht, Maastricht, The Netherlands |