1. Department of Surgery (Neurosurgery), Kansas University College of Health Sciences, Kansas City, Kansas, and Veterans Administration Medical Center, Kansas City, Missouri
2. Department of Otorhinolaryngology, Kansas University College of Health Sciences, Kansas City, Kansas, and Veterans Administration Medical Center, Kansas City, Missouri
3. Department of Radiology, Kansas University College of Health Sciences, Kansas City, Kansas, and Veterans Administration Medical Center, Kansas City, Missouri
4. Department of Pathology, Kansas University College of Health Sciences, Kansas City, Kansas, and Veterans Administration Medical Center, Kansas City, Missouri