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2Department of Orthopaedic Surgery, South Auckland Clinical School, University of Auckland, Middlemore Hospital, Private Bag 93 311, Otahuhu, Auckland 6, New Zealand, , , ,
1Department of Anaesthesia and Intensive Care, Waldkrankenhaus St Marien, Erlangen, Germany, , , ,
2Department of Orthopaedic Surgery, South Auckland Clinical School, University of Auckland, Middlemore Hospital, Private Bag 93 311, Otahuhu, Auckland 6, New Zealand, , , ,