1 Department of Population Health, London School of Hygiene & Tropical Medicine, London WC1E 7HT, UK. Electronic address: [email protected].
2 Department of Public and Occupational Health, Amsterdam University Medical Centers, Amsterdam, Netherlands.
3 Department of Obstetrics and Gynaecology, Amsterdam University Medical Centers, Amsterdam, Netherlands.
4 Paediatric Intensive Care Unit, Emma Children's Hospital, Amsterdam University Medical Centers, Amsterdam, Netherlands.
5 Department of Anaesthesiology, Amsterdam University Medical Centers, Amsterdam, Netherlands; Centre for Sustainable Healthcare, Amsterdam University Medical Centers, Amsterdam, Netherlands.