Viroj Wiwanitkit1,2,3,4,5. 1. a Tropical Medicine Unit , Hainan Medical University , Haikou , China. 2. b Faculty of Medicine , University of Nis , Nis , Serbia. 3. c Department of Biological Science , Joseph Ayobabalola University , Ikeji-Arakeji , Nigeria. 4. d Department of Community Medicine , Dr. DY Patil Medicine University , Pune , India. 5. e Public Health Curriculum , Surin Rajabhat University , Surin , Thailand.