1. CT Section of The Second Hospital Affiliated Qiqihar Medical University, Qiqihar 161000, Heilongjiang, China
2. Qiqihar Medical University, Qiqihar 161000, Heilongjiang, China
3. Ultrasound Department, The Third Hospital Affiliated Qiqihar Medical University, Qiqihar 161000, Heilongjiang, China
4. Radiology Center, The Third Hospital Affiliated Qiqihar Medical University, Qiqihar 161000, Heilongjiang, China