Wang Gu1, Zhong Tong2. 1. Anhui Medical University Third Affiliated Hospital, 390 Huaihe Road, Luyang District, Hefei City, Anhui Province, China. 2. Anhui Medical University Third Affiliated Hospital, 390 Huaihe Road, Luyang District, Hefei City, Anhui Province, China. Electronic address: tougao2425@163.com.