Horlocker TT, Wedel DJ, Benzon H, et al: Regional anesthesia in the anticoagulated patient: defining the risks (The second ASRA consensus conference on neuraxial anesthesia and anticoagulation). Reg Anesth Pain Med 2003; 28: 172-97
Cheney FW: The American Society of Anesthesiologists Closed Claims Project: what have we learned, how has it affected practice, and how will it affect practice in the future? Anesthesiology 1999; 91: 552-6