1. China National Tobacco Quality Supervision and Test Center Zhengzhou China
2. Zhengzhou Tobacco Research Institute of China National Tobacco Corporation Zhengzhou China
3. Sichuan Tobacco Quality Supervision and Testing Station Chengdu China
4. Yunnan Academy of Tobacco Agricultural Sciences of China National Tobacco Corporation Kunming China
5. Department of Medical Microbiology School of Basic Medical Science Shandong University Jinan China