1. University of Arizona School of Medicine, Tucson.
2. Institute for Peripheral Nerve Surgery: Southwest, Tucson, AZ. Dr. Barrett is now at the Midwestern University College of Health Sciences, Glendale, AZ.
3. Microsurgery Unit, Department of Orthopedic Surgery, University of Turin, Turin, Italy.
4. Division of Plastic Surgery and Neurosurgery, Departments of Surgery and Anatomy, University of Arizona, Tucson.
5. Division of Plastic Surgery, Department of Neurosurgery, The Johns Hopkins University, Baltimore, MD.