[1] Khanh Hoa Prov Gen Hosp, Dept Senior Internal, Nha Trang City, Vietnam
[2] Univ Med Ctr, Dept Neurol, Movement Disorder Unit, Ho Chi Minh City, Vietnam
[3] Univ Med Ctr, Dept Neurol, Ho Chi Minh City, Vietnam
[4] Univ Med & Pharm, Fac Med, Dept Physiol, Ho Chi Minh City, Vietnam