Affiliation: | 1. 1Marlies Rijnders is a Research Midwife, 3Yvonne Sch?nbeck is an Epidemiologist, 4Karin van der Pal and Simone Buitendijk are Perinatal Epidemiologists at TNO Quality of Life, Leiden, The Netherlands;2. 2Helen Baston is a Researcher and Lecturer in Midwifery and 6Josephine Green is a Professor of Psychosocial Reproductive Health at the Mother and Infant Research Unit, University of York, York, United Kingdom;3. and 5Marianne Prins is a Lecturer in midwifery at Midwifery Academy Amsterdam, Amsterdam, The Netherlands. |