1. Department of Pediatric Surgery, The First Affiliated Hospital of Sun Yat-sen University, Sun Yat-sen University, Guangzhou, China.
2. Department of Medical Ultrasonics, Institute of Diagnostic and Interventional Ultrasound, The First Affiliated Hospital of Sun Yat-sen University, Sun Yat-sen University, Guangzhou, China.
3. Department of Pathoglogy, The First Affiliated Hospital of Sun Yat-sen University, Sun Yat-sen University, Guangzhou, China.