1. Professor, University of New Mexico Medical Center, Department of Orthopedics, Albuquerque, New Mexico.
2. Senior Orthopedic Resident, University of New Mexico Medical Center, Department of Orthopedics, Albuquerque, New Mexico.
3. Professor, Department of Orthopedics, University of Iowa Hospitals and Clinics, Iowa City, Iowa.
4. Senior Orthopedic Resident, Department of Orthopedics, University of Iowa Hospitals and Clinics, Iowa City, Iowa.
5. Professor, Department of Orthopedics, University of North Carolina, Raleigh, North Carolina.
6. Professor, Department of Orthopedics, University of Virginia, Charlottesville, Virginia.