1. Department of Medicine, Loma Linda University School of Medicine, Loma Linda, CA, USA
2. Center for Advanced Statistics in Education, VA Loma Linda Healthcare System, 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 Veterans Affairs, Office of Academic Affiliations (10A2D), Washington, DC, USA