[1] White Mt Inst, Los Altos, CA 94022 USA
[2] Cedars Sinai Med Ctr, Dept Anesthesia, Los Angeles, CA 90048 USA
[3] Policlin Abano, Abano Terme, Italy
[4] Massachusetts Gen Hosp, Dept Anesthesia Crit Care & Pain Management, Boston, MA 02114 USA
[5] Harvard Univ, Sch Med, Boston, MA USA
[6] Columbia Univ, Dept Anesthesiol, New York, NY USA