[1] Yuhuangding Hosp, Yantai 264000, Shandong, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Med, RuiJin Hosp, Shanghai 200030, Peoples R China
[3] Capital Med Univ, Beijing Anzhen Hosp, Dept Radiol, Beijing, Peoples R China
[4] Fourth Mil Med Univ, Xijing Hosp, Xian, Shaanxi, Peoples R China
[5] Binzhou Med Univ, Shandong Prov Characterist Key Subject Med Imagin, Yantai, Shandong, Peoples R China