TY - JOUR T1 - The carotid endarterectomy trial: selection bias? JF - Canadian Medical Association Journal JO - CMAJ SP - 10 LP - 11 VL - 141 IS - 1 AU - C. Del Campo Y1 - 1989/07/01 UR - http://www.cmaj.ca/content/141/1/10.abstract ER -