1. From the Department of Anesthesia, Critical Care and Pain Medicine, Anesthesia Center for Critical Care Research, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts (S.M., A.B., B.Y., G.F., J.A.G., M.W., K.D.B., D.B.B., W.M.Z.); Department of Anesthesiology and Critical Care Medicine, University Hospital Bonn, Bonn, Germany (S.M.); Department of Materials Science and