1. Department of Gastroenterology, The Second Hospital of Shandong University, Jinan, Shandong, China (mainland)
2. Department of Trauma and Orthopaedics, The Second Hospital of Shandong University, Jinan, Shandong, China (mainland)
3. Department of Gastroenterology, the Second Hospital of Shandong University, , China (mainland)
4. Center of Evidence-based Medicine, The Second Hospital of Shandong University, Jinan, Shandong, China (mainland)