1. Department of Biomedical Data Sciences, Leiden University Medical Center, Leiden, the Netherlands
2. Department of Statistics, Columbia University, New York
3. Department of Political Science, Columbia University, New York
4. Department of Epidemiology, University of California, Los Angeles, Los Angeles
5. Department of Statistics, University of California, Los Angeles, Los Angeles
6. Graduate School of Business, Department of Economics, Stanford University, Stanford, CA
7. Swisstransplant, Bern, Switzerland
8. Department of Epidemiology and Population Health, Stanford University, Stanford, CA