1. College of Electronics and Information Engineering, Sichuan UniversityNo. 29 JiuyanqiaoWangjiang RoadChengdu610064People's Republic of China
2. Department of RadiologyNew York University660 1st AvenueNew York10016USA
3. Department of Biomedical EngineeringJohns Hopkins University School of Medicine720 Rutland AvenueBaltimore21205USA