1. University of Memphis, Memphis, TN, USA
2. National Health Institute, Baltimore, MD, USA
3. Troy University, Troy, AL, USA
4. Western Washington University, Bellingham, WA, USA
5. Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
6. Johns Hopkins University, Baltimore, MD, USA
7. University of Michigan, Ann Arbor, MI, USA
8. University of Minnesota, Duluth, MN, USA