1. Faculty of Medicine Siriraj Hospital Mahidol University Bangkok 10700 Thailand
2. Siriraj Neuroimmunology Center, Division of Neurology, Department of Medicine, Faculty of Medicine Siriraj Hospital Mahidol University Bangkok 10700 Thailand
3. Division of Neurology, Department of Medicine, Faculty of Medicine Siriraj Hospital Mahidol University Bangkok 10700 Thailand
4. Division of Hematology, Department of Medicine, Faculty of Medicine Siriraj Hospital Mahidol University Bangkok 10700 Thailand