1. Barcelona Institute for Global Health (ISGlobal) , Barcelona, Spain
2. Universitat Pompeu Fabra (UPF) , Barcelona, Spain
3. Epigeny , St Ouen, France
4. Population Health Sciences Institute, Newcastle University , Newcastle, UK
5. MRC Epidemiology Unit, University of Cambridge School of Clinical Medicine , Cambridge, UK
6. Centro de Investigación Biomédica en Red en Epidemiología y Salud Pública , Barcelona, Spain