Corresponding Author

Department of Ultrasound, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China

Correspondence

Hua-Wei Zhang, Department of Ultrasound, Shandong Provincial Hospital Affiliated to Shandong First Medical University, No. 324, Jing 5 Rd, Jinan, Shandong 250021, China.

Email: slyyzhw@163.com