1. Department of Rehabilitation Medicine, Box 359740, 325-9th Avenue, University of Washington School of Medicine, Seattle, WA 98104-2499, USA,
2. Department of Rehabilitation Medicine, Box 359740, 325-9th Avenue, University of Washington School of Medicine, Seattle, WA 98104-2499, USA
3. Department of Rehabilitation Medicine, Box 359740, 325-9th Avenue, University of Washington School of Medicine, Seattle, WA 98104-2499, USA, Multidisciplinary Pain Center, University of Washington Medical Center-Roosevelt, 4245 Roosevelt Way Northeast, Seattle, WA 98105-6920, USA