1. From the Department of Diving and Hyperbaric Medicine, Faculty of Medicine, University of NSW, Sydney, Australia (M.H.B.); Department of Anaesthesia and Critical Care, University of Würzburg, Würzburg, Germany (S.W., A.S., P.K.); Department of Radiation Oncology, The Epworth Hospital, Richmond, Australia (J.W.); and Department of Medicine (RMH), University of Melbourne, Australia (C.F.).