1Department of Orthopaedics and Sports Medicine, University of Washington, Harborview Medical Center, 325 Ninth Avenue, Box 359798, Seattle, WA 98104
2Department of Orthopaedic Surgery, University of California, San Francisco, 2550 23rd Street, Building A, 2nd floor, San Francisco, CA 94110
3University of Minnesota, Regions Hospital, Mail Stop 11503L, 640 Jackson Street, St. Paul, MN 55101
4Orthopaedic Associates of Michigan, 230 Michigan Street NE, Suite 300,Grand Rapids, MI 49503