1. Chief Resident, Division of Orthopaedic Surgery, Duke University Medical Center, P.O. Box 3000, Durham, North Carolina 27710.
2. Assistant Professor, Division of Orthopaedic Surgery, Duke University Medical Center, P.O. Box 3000, Durham, North Carolina 27710.
3. James B. Duke Professor Emeritus, Division of Orthopaedic Surgery, Duke University Medical Center, P.O. Box 3000, Durham, North Carolina 27710.