1. Naval Medical Center San Diego, San Diego, California, USA.
2. School of Medicine, The University of Texas Medical Branch, Galveston, Texas, USA.
3. Naval Medical Center Portsmouth, Portsmouth, Virginia, USA.
4. Texas A&M College of Medicine, College Station, Texas, USA.
5. Department of Preventive Medicine and Population Health, The University of Texas Medical Branch, Galveston, Texas, USA.