1. Key Laboratory of Tropical Medicinal Resource Chemistry of Ministry of Education, College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou, P. R. China
2. Hainan Center for Disease Control & Prevention, Haikou, P. R. China
3. Medical College, Hubei University of Arts and Science, XiangYang, HuBei, P. R. China
4. Key Laboratory of Medicinal and Edible Plants Resources of Hainan Province, Hainan Vocational University of Science and Technology, Haikou, P. R. China