Ling-Qi Kong^1*,　　Ning Lang²,<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com:office:office" />

Hong-Bin Han²,　　Jing-Xia Xie²,

Bao-Jun Wang³

1. Department of Radiology, Qingdao University, Affiliated Hospital, 16# Jiangsu Rd, Qingdao 266003, China

2. Department of Radiology, Peking University, Third Hospital, 39# North Garden Rd, Beijing 100083, China

3. Department of Neurology, Peking University, Third Hospital, 39# North Garden Rd, Beijing 100083, China

*Address correspondence to: Dr. Ling-Qi Kong