1. GME, Naval Medical Center Portsmouth , Portsmouth, VA 23708, USA
2. Orthopedic Surgery, Walter Reed National Military Medical Center , Bethesda, MD 20889, USA
3. Department of Medicine and Pathology, Uniformed Services University of the Health Sciences , Bethesda, MD 20814, USA
4. Department of Library Services, Uniformed Services University of the Health Sciences, HPE , Bethesda, MD 20814-4712, USA
5. Department of Library Services, Uniformed Services University of the Health Sciences , Bethesda, MD 20814-4712, USA
6. Department of Medicine, Division of HPE, F. Edward Hebert School of Medicine, Uniformed Services University of the Health Sciences , Bethesda, MD 20814-4712, USA