1. Department of Orthopedic Surgery, Mayo
Clinic, Rochester, Minnesota, USA
and Department of Orthopedic Surgery, Oslo
University Hospital, Oslo, Norway.
2. Robert D. and Patricia E. Kern Center
for the Science of Health Care Delivery, Mayo Clinic, Rochester, Minnesota, USA.
3. Department of Orthopedic Surgery, Mayo
Clinic, Rochester, Minnesota, USA.
4. Department of Orthopedic Surgery, Mayo
Clinic, Rochester, Minnesota, USA
and Department of Biological Sciences, Hampton
University, Hampton, Virginia, USA.
5. Department of Orthopedic Surgery, Oslo
University Hospital, Oslo, Norway.
6. Department of Orthopedic Surgery and Department
of Biochemistry and Molecular Biology, Mayo Clinic, Rochester, Minnesota, USA.