1. Epidemiology Unit, Health Research Institute─Fundación Jimenez Díaz, University Hospital, Universidad Autónoma de Madrid, Madrid, Spain
2. Program On Regulation, Therapeutics, And Law (PORTAL), Division of Pharmacoepidemiology and Pharmacoeconomics, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts
3. Computational Health Informatics Program (CHIP), Boston Children’s Hospital, Boston, Massachusetts
4. Department of Pediatrics, Harvard Medical School, Boston, Massachusetts