RT Journal Article SR Electronic T1 The value (and limitations) of surgical rate variation analysis JF Canadian Journal of Surgery JO CAN J SURG FD Canadian Medical Association SP 351 OP 352 VO 39 IS 5 A1 Tandan, Véd A1 Langer, Bernard YR 1996 UL http://canjsurg.ca/content/39/5/351.abstract