1. Department of Public Health, the University of Tennessee Knoxville, Knoxville, TN, USA
2. Department of Biostatistics and Epidemiology, University of North Texas Health Science Center, Fort Worth, TX, USA
3. Division of Research, Kaiser Permanente Northern California, Oakland, CA, USA
4. School of Medicine, University of California, Davis, Sacramento, CA, USA
5. Kaiser Permanente Roseville Medical Center, Roseville, CA, USA