1. University at Buffalo, Department
of Orthopaedic Surgery, 462 Grider Street, Buffalo, New
York 14215, USA.
2. University of Michigan, Department
of Radiology, Ann Arbor, Michigan
48109-0326, USA.
3. Mayo Clinic, 200
First St., SW, Rochester, Minnesota
55905, USA.
4. Mayo Clinic, Department
of Health Sciences, 200 First St., SW, Rochester, Minnesota 55905, USA.