1. Section of Orthopaedic Surgery, University of Michigan Hospitals, 2912 Taubman Center, Box 0328, 1500 E. Medical Center Dr., Ann Arbor, MI 48109.
2. Orthopaedic Surgery Associates, Catherine McAuley Health Center, Institute for Preventative Sports Medicine, Ann Arbor, Michigan.
3. Department of Orthopaedic Surgery, University of Iowa, Iowa City, Iowa.