1. Department of Mathematics, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
2. Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, MA
3. CAUSALab, Harvard T. H. Chan School of Public Health, Boston, MA
4. Department of Statistics, The Wharton School, University of Pennsylvania, Philadelphia, PA
5. Department of Population Medicine, Harvard Medical School and Harvard Pilgrim Health Care Institute, Boston, MA