Early postoperative cognitive recovery and gas exchange patterns after balanced anesthesia with sevoflurane or desflurane in overweight and obese patients undergoing craniotomy: A prospective randomized trial - Bilotta, F; Doronzio, A; Cuzzone, V; Caramia, R; Rosa, G; PINOCCHIO Study Group (J Neurosurg Anesthesiol, 2009)