1. Graduate School of Nursing, Uniformed Services University of the Health Sciences , Bethesda, MD 20814, USA
2. Department of Neurology, University of Tennessee Health Science Center, College of Medicine , Memphis, TN 38163, USA
3. Landstuhl Regional Medical Center, Unit 33100, APO , Landstuhl 66849, Germany
4. Lackland Airforce Base, Science and Technology, Center for Clinical Inquiry , JBSA Lackland, TX 78236, USA