1. Swedish Neuroscience Institute, Swedish Medical Center, Seattle, WA, USA
2. Seattle Science Foundation, Seattle, WA, USA
3. BG University Hospital Bergmannsheil, Ruhr University Bochum, Bochum, Germany
4. Hansjörg Wyss Hip and Pelvic Center, Swedish Hospital, Seattle, WA, USA
5. Riverside University Health Systems, Moreno Valley, CA, USA
6. Spectrum Research, Tacoma, WA, USA