1. Labratory of Vitamin C and Immunology, Department of Anatomy, Seoul National University College of Medicine, Seoul, Korea.
2. Department of Rehabilitation Medicine, Seoul National University College of Medicine, Seoul, Korea.
3. Department of Psychology, Boston College, Chestnut Hill, MA, USA.
4. Division of Hematology-Oncology, Department of Internal Medicine, Ewha Womans University School of Medicine, Seoul, Korea.