1. Division of Medicine, Taksin Hospital, Medical Service Department, Bangkok Metropolitan Administration, Bangkok, Thailand
2. Department of Medicine, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
3. Excellence Center in Diabetes, Hormone and Metabolism, King Chulalongkorn Memorial Hospital, Thai Red Cross Society, Bangkok, Thailand
4. Department of Neurology, Texas Tech University Health Sciences Center El Paso, El Paso, USA