1. Department of Otorhinolaryngology, International St. Mary's Hospital, Incheon, Korea.
2. Research & Development Center, Ahngook Pharmacy Co. Ltd., Suwon, Korea.
3. Natural Products Laboratory, School of Pharmacy, Sungkyunkwan University, Suwon, Korea.
4. Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Korea.