1. Department of Public Health Sciences, Center for Addiction and Prevention Research, University of Virginia, Lackland AFB, TX, USA
2. Department of Public Health Sciences, Center for Addiction and Prevention Research, University of Virginia, Charlottesville, VA, USA
3. Division of Biostatistics, Department of Preventive Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
4. Mayo Clinic, Rochester, MN, USA
5. Wilford Hall Ambulatory Surgical Center, Lackland AFB, TX, USA
6. St. Jude Children’s Hospital, Memphis, TN, USA
7. Department of Surgery, University of Tennessee Health Science Center, Memphis, TN, USA