1. Department of Surgery, Yonsei University Wonju College of Medicine, Wonju, Korea.
2. Department of Hemato-Oncology, Yonsei University Wonju College of Medicine, Wonju, Korea.
3. FCB-Pharmicell Co., Ltd. Seongnam, Korea.
4. Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine, Wonju, Korea.