1. Clinical Vaccine R&D Center, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Hwasun, Korea.
2. Department of Pharmacology and Dental Therapeutics, School of Dentistry, Chonnam National University, Gwangju, Korea.
3. Department of Microbiology, Chonnam National University Medical School, Gwangju, Korea.