1. aYale School of Public Health, New Haven, Connecticut
2. bCenter for Population Health Research, University of Montana, Missoula, Montana
3. cSchool of Public and Community Health Sciences, University of Montana, Missoula, Montana
4. dInstitute for Health Research, Kaiser Permanente Colorado, Aurora, Colorado
5. eDepartment of Epidemiology, University of Colorado School of Public Health, Aurora, Colorado
6. fDepartment of Pediatrics, University of Colorado School of Medicine, Aurora, Colorado