1. UC San Diego School of Medicine, University of California San Diego, La Jolla, California, USA
2. Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, Minnesota, USA
3. Department of Epidemiology, School of Public Health, University of Alabama at Birmingham, Birmingham, Alabama, USA
4. Division of Public Health Sciences, Department of Surgery, Washington University in St. Louis, St. Louis, Missouri, USA
5. School of Nursing, University of Minnesota, Minneapolis, Minnesota, USA
6. School of Nursing, University of Michigan, Ann Arbor, Michigan, USA
7. Department of Biostatistics, School of Public Health, University of Minnestora, Minneapolis, Minnesota, USA