Anthony M H Ho1, Po T Chui, Alex P W Lee, Song Wan. 1. Department of Anesthesiology and Perioperative Medicine, Queen's University and Kingston General Hospital, Kingston, Ontario, Canada, hoamh@hotmail.com Departments of Anaesthesia and Intensive Care, Medicine & Therapeutics, and Surgery, The Chinese University of Hong Kong and Prince of Wales Hospital, Hong Kong SAR, People's Republic of China.