1 Community Respiratory Service, Canterbury Clinical Network, Christchurch, New Zealand.
2 Department of Anaesthesiology, Madang Provincial General Hospital, Madang, Papua New Guinea.
3 Department of Anaesthesia, University of Otago, Christchurch Hospital, Christchurch, New Zealand, World Federation of Societies of Anaesthesiologists, London, United Kingdom, w.morriss@me.com.
4 Department of Anaesthesia, Concord Repatriation General Hospital, New South Wales, Sydney, Australia.
5 Department of Anaesthesiology, School of Medicine, University of Western Australia, Perth, Western Australia, Australia.