1. From the Department of Anesthesia, Critical Care and Pain Medicine, Massachusetts General Hospital, Boston, Massachusetts (K.J.R., H.D., T.H.); Department of Anesthesiology, Herlev and Gentofte Hospital, Herlev, Denmark (J.B.S.); Department of Anesthesia, Critical Care and Pain Medicine, Beth Israel Deaconess Hospital, Boston, Massachusetts (J.Patlak, M.E.); Helios Klinikum Krefeld, Klinik für Or