1. Wingate Institute of Neurogastroenterology, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, United Kingdom
2. Department of Medicine, Hualien Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation and Tzu Chi University, Hualien, Taiwan
3. Centre for Tumour Biology, Barts Cancer Institute, Queen Mary University of London, London, United Kingdom