1 Department of Neurology, Tri-Service General Hospital, National Defense Medical Center, No. 325, Section 2, Cheng-Kung Road, Neihu, Taipei, Taiwan, Republic of China.
2 Division of Ophthalmology, Taichung Veterans General Hospital Puli Branch, No. 1, Rongguang Road, Puli Township, Nantou County 545, Taiwan, Republic of China.