1. MRC-PHE (Medical Research Council–Public Health England) Centre for Environment and Health, Department of Epidemiology and Biostatistics, School of Public Health, Imperial College London, St Mary’s Campus, Norfolk Place, London, United Kingdom
2. Bradford Institute for Health Research, Bradford Royal Infirmary, Bradford, United Kingdom
3. Center for Research in Environmental Epidemiology (CREAL), IMIM (Hospital del Mar Medical Research Institute), CIBERESP (Centro de Investigación Biomédica en Red de Epidemiología y Salud Pública), Barcelona, Spain