1. Dept of Anaesthesia and Intensive Care, John Hunter Hospital, Newcastle, N.S.W.
2. Dept of Anaesthesia and Intensive Care Unit, Austin and Repatriation Medical Centre, Heidelberg, Vic.
3. Dept of Anaesthesia and Intensive Care, Royal Adelaide Hospital, Adelaide, S.A.
4. Department of Anaesthesia and Intensive Care, University of Adelaide and Royal Adelaide Hospital, Adelaide, S.A.