Beuy Joob1, Viroj Wiwanitkit2. 1. Sanitation 1 Medical Academic Center, Bangkok, Thailand. Electronic address: beuyjoob@hotmail.com. 2. Faculty of Medicine, University of Nis, Serbia; Hainan Medical University, Haikou, China; Joseph Ayobabalola University, Ikeji-Arakeji, Nigeria; Dr DY Patil Medical University, Pune, India.