1. From the Department of Medicine, University of Melbourne, Austin and Repatriation Medical Centre, Heidelberg West, Australia (R.C., K.A.J.-D., Z.C., S.P.N., W.C.B., M.E.C., T.J.A.); the Kolling Institute of Medical Research, University of Sydney, Royal North Shore Hospital, St Leonards, Australia (S.M.T.); and the Morphology Laboratory, Baker Medical Research Institute, Melbourne, Australia (R.J.D.).