1 Department of Surgery, University Hospital Limerick, Mid-Western Region, Ireland and School of Medicine, Education Health Sciences, University of Limerick, Limerick, Ireland. Electronic address: [email protected].
2 Guangdong Provincial Key Laboratory of Gastroenterology, Institute of Gastroenterology of Guangdong Province, Department of Gastroenterology, Nanfang Hospital, Southern Medical University, Guangzhou, China.