1. Johns Hopkins Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA.
2. Medical City Plano, Plano, Texas, USA.
3. Swedish Medical Center, Englewood, Colorado, USA.
4. Wesley Medical Center, Wichita, Kansas, USA.
5. Penrose Hospital, Colorado Springs, Colorado, USA.
6. St. Anthony Hospital, Lakewood, Colorado, USA.
7. South Texas Health System McAllen, McAllen, Texas, USA.