1. Department of Orthopaedic Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei Province, China
2. Department of Colorectal and Anal Surgery, Zhongnan Hospital of Wuhan University, Wuhan, Hubei Province, China
3. Department of Gastroenterology, Renmin Hospital of Wuhan University, Wuhan, Hubei Province, China
4. Department of Medicine, Ziauddin Hospital, Karachi, Sindh, Pakistan
5. Department of Medicine, Chandka Medical College, Shaheed Mohtarma Benazir Bhutto Medical University, Larkana, Sindh, Pakistan