[1] Univ Malaya, Fac Med, Dept Med, Gastroenterol & Hepatol Unit, Kuala Lumpur, Malaysia
[2] Univ Malaya, Fac Med, Dept Surg, Kuala Lumpur, Malaysia
[3] Pantai Hosp Kuala Lumpur, Kuala Lumpur, Malaysia
[4] Kuala Lumpur Gen Hosp, Dept Med, Gastroenterol & Hepatol Unit, Kuala Lumpur, Malaysia
[5] Natl Canc Inst, Dept Surg, Putrajaya, Malaysia
[6] Sultanah Bahiyah Hosp, Dept Med, Gastroenterol & Hepatol Unit, Alor Setar, Kedah, Malaysia
[7] Sultanah Aminah Hosp, Dept Gen Surg, Johor Baharu, Johor, Malaysia
[8] Sultan Ismail Hosp, Dept Med, Gastroenterol & Hepatol Unit, Johor Baharu, Johor, Malaysia
[9] Penang Gen Hosp, Dept Gen Surg, George Town, Penang, Malaysia
[10] Queen Elizabeth Hosp, Dept Med, Gastroenterol & Hepatol Unit, Kota Kinabalu, Sabah, Malaysia
[11] Queen Elizabeth Hosp, Dept Surg, Kota Kinabalu, Sabah, Malaysia
[12] Serdang Hosp, Dept Med, Gastroenterol & Hepatol Unit, Serdang, Selangor, Malaysia
[13] Sarawak Gen Hosp, Dept Gen Surg, Kuching, Sarawak, Malaysia
[14] Univ Sains Malaysia, Sch Med Sci, Kota Baharu 16150, Kelantan, Malaysia
[15] Univ Sains Malaysia Hosp, GI Funct & Motil Unit, Kota Baharu, Kelantan, Malaysia