Spinal anesthesia with lidocaine or preservative-free 2-chlorprocaine for outpatient knee arthroscopy: a prospective, randomized, double-blind comparison
University of Parma, Department of Anesthesiology and Pain Therapy, Ospedale Maggiore di Parma, Via Gramsci 14, 43100 Parma, Italy. andrea.casati@unipr.it