1. Center for Research in Environmental Epidemiology, Barcelona, Spain
2. Hospital del Mar Research Institute (IMIM), Barcelona, Spain
3. CIBER Epidemiología y Salud Pública, Spain
4. Educational Unit of Preventive Medicine and Public Health, Hospital del Mar–Pompeu Fabra University–Agencia de Salut Pública, Barcelona, Spain
5. Institute of Health and Society, Newcastle University, Newcastle upon Tyne, United Kingdom