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Epidemiology • Volume 31, Number 2, March 2020 www.epidem.com | 155 From the Department of Preventive Medicine and Public Health, University of Santiago de Compostela, Spain; CIBER de Epidemiología y Salud Pública. CIBERESP, Spain; and Centre for Occupational and Environmental Health, University of Manchester, United Kingdom. Disclosure: This commentary was sponsored by the International Society of Environmental Epidemiology (ISEE). The contents are the sole responsibility of the authors and do not necessarily reflect the official views of the ISEE. Correspondence: Alberto Ruano-Ravina, Department of Preventive Medicine and Public Health, School of Medicine, C/ San Francisco s/n, University of Santiago de Compostela, 15782, Santiago de Compostela, Spain. E-mail: [email protected].