1. The Center for Torticollis, Department of Physical Medicine and Rehabilitation, Ajou University School of Medicine, Suwon 443-721, Korea.
2. Department of Pathology, Ajou University School of Medicine, Suwon 443-721, Korea.
3. Department of Plastic and Reconstructive Surgery, Ajou University School of Medicine, Suwon 443-721, Korea.
4. Department of Radiology, Ajou University School of Medicine, Suwon 443-721, Korea.