1. Faculty of Epidemiology and Population Health, Department of Non-Communicable Disease Epidemiology, Cancer Survival Group, London School of Hygiene and Tropical Medicine, London, United Kingdom
2. Laboratory for Psychiatric Biostatistics, McLean Hospital, Belmont, Massachusetts
3. Harvard Medical School, Harvard University, Boston, Massachusetts
4. National Research Council of Italy, Research Institute on Sustainable Economic Growth, Rome, Italy