Somsri Wiwanitkit1, Viroj Wiwanitkit2,3,4,5,6. 1. Wiwanitkit House, Bangkhae, Bangkok, Thailand. somsriwiwan@hotmail.com. 2. Hainan Medical University, Haikou, China. 3. Faculty of Medicine, University of Nis, Nis, Serbia. 4. Joseph Ayobabalola University, Ikeji-Arakeji, Nigeria. 5. Dr DY Patil Medicine University, Pune, India. 6. Surin Rajabhat University, Surin, Thailand.