TY - JOUR T1 - Follow-up endoscopy JF - Canadian Medical Association Journal JO - CMAJ SP - 1773c LP - 1773 VL - 149 IS - 12 AU - M. S. Wolochow Y1 - 1993/12/15 UR - http://www.cmaj.ca/content/149/12/1773c.abstract ER -