1. Department of Pathology, Maha Chakri Sirindhorn Medical Center, Faculty of Medicine, Srinakharinwirot University, Nakhon Nayok, Thailand;
2. Department of Pathology, Faculty of Medicine, Prince of Songkla University, Songkhla, Thailand;
3. College of Medicine and Public Health, Ubon Ratchathani University, Ubon Ratchathani, Thailand