1. Department of Statistics, College of Natural Sciences, Colorado State University, Fort Collins, CO, 80521, USA
2. Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
3. Department of Family and Preventive Medicine, College of Medicine, University of Oklahoma, Oklahoma City, OK, 73104, USA
4. Department of Population Health Sciences, College of Medicine, University of Utah, Salt Lake City, UT, 84132, USA