1. Laboratory of Influenza Research, Chungnam National University, Daejeon, Korea.
2. Institute of Influenza Research, Chungnam National University, Daejeon, Korea.
3. Laboratory of Public Health, Chungnam National University, Daejeon, Korea.
4. Laboratory of Pathology, College of Veterinary Medicine, Chungnam National University, Daejeon, Korea.