1. Division of Urology, Department of Surgery, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand.
2. Pathology Department, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand.
3. Division of Allergy-Immunology-Rheumatology, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand.