Shui Shan Lee, Hong Kong, Hong Kong, China
Tikur Anbesa specialised hospital, Addis Ababa, Ethiopia
University of Gondar specialised hospital, Gondar, Ethiopia
The Chinese University of Hong Kong, Hong Kong, Hong Kong
Chinese University of Hong Kong, Hong Kong, Hong Kong
The chinese University of Hong Kong, Hong Kong, Hong Kong
Asian Institute of Gastroenterology, Hyderabad, India
Deenanath Mangeshkar Hospital & Research Centre, Pune, India
Royal Adelaide Hospital, Adelaide, Australia
Prince of Wales Hospital, Hong Kong, Hong Kong
North District Hospital, Sheung Shui, Hong Kong
The Chinese University of Hong Kong, Hong Kong, Hong Kong