1. Department of Anesthesiology, Defense and Veterans Center for Integrative Pain Management, Uniformed Services University, Bethesda, Maryland, USA.
2. Department of Anesthesiology, Duke University Medical Center, Durham, North Carolina, USA.
3. School of Medicine, Uniformed Services University, Bethesda, Maryland, USA.
4. Department of Anesthesiology, Brooke Army Medical Center, Fort Sam Houston, Texas, USA.
5. Department of Orthopaedic Surgery, Brooke Army Medical Center, Fort Sam Houston, Texas, USA.
6. Henry M. Jackson Foundation for the Advancement of Military Medicine Inc, Bethesda, Maryland, USA.
7. Nell Hodgson Woodruff School of Nursing, Emory University, Atlanta, Georgia, USA.