1. 1Division of Virology and Serology, Department of Pathology, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand;
2. 2Division of Nephrology, Department of Internal Medicine, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand;
3. 3Division of Infectious Disease, Department of Internal Medicine, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand;
4. 4Department of Biomedical Science, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand