TY - JOUR T1 - Several Chinese herbal products may contain toxic aristolochic acid JF - Canadian Medical Association Journal JO - CMAJ SP - 449 LP - 449 DO - 10.1503/cmaj.1041266 VL - 171 IS - 5 AU - Eric Wooltorton Y1 - 2004/08/31 UR - http://www.cmaj.ca/content/171/5/449.abstract ER -