1. Assistant Professor of Medicine, The Henry M Jackson Foundation for the Advancement of Military Medicine , Uniformed Services University of the Health Sciences , Bethesda, MD , USA
2. Professor of Medicine and Pathology , Uniformed Services University of the Health Sciences , Bethesda, MD , USA
3. Professor of Health, Human Function and Rehabilitation Sciences, School of Medicine and Health Sciences , The George Washington University , Washington, DC , USA
4. Research Associate, The Henry M Jackson Foundation for the Advancement of Military Medicine , Uniformed Services University of the Health Sciences , Bethesda, MD , USA