aDepartment of Clinical-Surgical, Diagnostic and Pediatric Sciences, Unit of Anesthesia and Intensive Care, University of Pavia, Pavia, Italy

bAnesthesia and Intensive Care, Fondazione IRCCS Policlinico S. Matteo, Pavia, Italy

Correspondence to Francesco Mojoli, S.C. Anestesia e Rianimazione 1, Fondazione IRCCS Policlinico S. Matteo, DEA piano -1, Viale Golgi 19, 27100 Pavia, Italy. Tel: +39 0382 503512; fax: +39 0382 503080; e-mail: [email protected]