1 Department of Women and Children's Health, School of Life Science and Medicine, King's College London, St Thomas Hospital, London, UK kaat.de_backer@kcl.ac.uk.
2 Section of Women's Mental Health, Health Service and Population Research Department, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London, UK.
3 South London and Maudsley NHS Foundation Trust, London, UK.
4 Department of Women and Children's Health, School of Life Science and Medicine, King's College London, St Thomas Hospital, London, UK.