1. From the Departments of Surgery (S. Bhat, P.G.J.) and Medicine (S.W.F.R.W.), The University of Auckland, Auckland, New Zealand; Department of Surgery, University of Otago, Dunedin, New Zealand (S. Bir); and Adult Emergency Department (F.S., P.G.J., S.W.F.R.W.), Department of Radiology (C.J.B.), and Green Lane Cardiothoracic Surgical Unit (S.W.F.R.W.), Auckland City Hospital, Auckland District Health Board, 85 Park Rd, Grafton, Auckland 1142, New Zealand.