1 Department of International Health, Maastricht University, Faculty of Health, Medicine and Life Sciences, CAPHRI, Maastricht, The Netherlands, Department of Health Information, NRW Centre for Health, Bielefeld, Germany, Department of Health Services Research and Policy, London School of Hygiene and Tropical Medicine, London, UK, Public Health Wales, Cardiff, Wales, Manchester Urban Collaboration on Health, University of Manchester, Manchester, UK, Department for Health Services and Prevention Forecasting, National Institute for Public Health and the Environment (rivm), Centre for Health and Society, Bilthoven, The Netherlands.