1. RAND Corporation , 1776 Main St. Santa Monica, CA, 90401, USA
2. France and Vaccine Research Institute Univ. Bordeaux, INSERM, INRIA, BPH, U1219, SISTM, F-33000 Bordeaux, , F-94000 Créteil, France
3. France and Vaccine Research Institute Univ. Bordeaux, INSERM, INRIA, BPH, U1219, SISTM, F-33000 Bordeaux, France, CHU de Bordeaux, Service d’Information médicale, F-33000 Bordeaux, , F-94000 Créteil, France
4. Department of Statistics and Data Sciences University of Texas at Austin, , 3925 West Braker Lane, Austin, TX 78759, USA