Dr. Polrat Wilairatana is a Professor in the Department of Clinical Tropical Medicine. He graduated from Mahidol University with a Doctor of Medicine degree, obtained his M.Sc. in Internal Medicine from Chulalongkorn University, and Ph.D. in Tropical Medicine from Mahidol University. He holds a number of diplomas, including Thai Board of Internal Medicine-subspecialty Gastroenterology and Thai Board of Internal Medicine-subspecialty Infectious Diseases from the Thai Medical Council, to name just a few. Dr Polrat is a Fellow of the Royal College of Physicians (FRCP), Thailand, Fellow of the Australasian College of Tropical Medicine (FACTM), Australia, and Fellow of the American College of Gastroenterology (FACG), USA.