1. Office of Academic Affiliations, Department of Veterans Affairs, Washington, DC, USA
2. Department of Medicine, Loma Linda University School of Medicine, Loma Linda, CA, USA
3. Martingale Research Corporation, Plano, TX, USA
4. School of Behavioral and Brain Sciences, University of Texas at Dallas, Richardson, TX, USA
5. Department of Biostatistics, School of Public Health, and Department of Psychiatry and Behavior Sciences, School of Medicine, University of Washington, Seattle, WA, USA
6. Department of Biostatistics, School of Public Health and International Center for Mathematical Research, Peking University, Beijing, People’s Republic of China