Parin Rattananon1, Sakditad Saowapa1, Chutintorn Sriphrapradang2. 1. Faculty of Medicine Ramathibodi Hospital, Department of Medicine, Mahidol University, Bangkok, 10400, Thailand. 2. Faculty of Medicine Ramathibodi Hospital, Department of Medicine, Mahidol University, Bangkok, 10400, Thailand. chutins@gmail.com.