1. Pacific Northwest University-Health Sciences Medical School , Yakima, WA 98901 , United States
2. Uniformed Services University Medical School , Bethesda, MD 20814 , United States
3. Department of Orthopaedic Surgery, Texas Tech University Health Science Center , El Paso TX 79905 , United States
4. Department of Orthopaedic Surgery, Maimonides Medical Center , Brooklyn, NY 11219 , United States