1. Department of Public HealthErasmus MC University Medical CenterRotterdam the Netherlands
2. Department of Family Medicine and Community Health, and the Department of Epidemiology Perelman School of MedicineUniversity of PennsylvaniaPhiladelphia Pennsylvania
3. Leonard Davis Center for Health Economics and Public Health InitiativesUniversity of PennsylvaniaPhiladelphia Pennsylvania
4. Department of Epidemiology and BiostatisticsMemorial Sloan Kettering Cancer CenterNew YorkNew York
5. Division of ResearchKaiser PermanenteOakland California
6. Surveillance and Health Services ResearchAmerican Cancer SocietyAtlanta Georgia