TY - JOUR T1 - Bias inherent in retrospective waiting-time studies: experience from a vascular surgery waiting list JF - Canadian Medical Association Journal JO - CMAJ SP - 1821 LP - 1822 VL - 162 IS - 13 AU - Boris Sobolev AU - Peter Brown AU - David Zelt AU - Samuel Shortt Y1 - 2000/06/27 UR - http://www.cmaj.ca/content/162/13/1821.abstract ER -