Ji Ning Sun1, Bao Long Zhang2, Hai Yan Yu1, Qiang Zhang3. 1. Department of Radiology, Weifang People's Hospital, No. 151, Guangwen Street, Kuiwen District, Weifang 261041, Shandong, China. 2. Department of Radiology, Weifang Maternity and Child Care Hospital, No. 76, Qingnian Road, Weicheng District, Weifang 261011, Shandong, China. 3. Department of Radiology, Weifang People's Hospital, No. 151, Guangwen Street, Kuiwen District, Weifang 261041, Shandong, China. Electronic address: 1785016898@qq.com.