1. Family & Community Health, Texas A&M AgriLife Extension, College Station, TX, USA (MDF, TW)
2. Health Science Center, Texas A&M School of Medicine, Bryan, TX, USA (MDF)
3. Health Science Center, Texas A&M School of Public Health, College Station, TX, USA (MDF, TW)
4. Unaffiliated, Boulder, CO, USA (CCF)
5. VA Boston Healthcare System, West Roxbury, MA, USA (EP)
6. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, MA, USA (EP)
7. Ardmore Institute of Health, Ardmore, OK, USA (RS)