TY - JOUR T1 - Folic acid supplementation: more work is needed JF - Canadian Medical Association Journal JO - CMAJ SP - 1129 LP - 1130 VL - 163 IS - 9 AU - James K. Friel Y1 - 2000/10/31 UR - http://www.cmaj.ca/content/163/9/1129.2.abstract ER -