RT Journal Article SR Electronic T1 Challenges for phytopharmacovigilance JF Postgraduate Medical Journal JO Postgrad Med J FD The Fellowship of Postgraduate Medicine SP 249 OP 250 DO 10.1136/pgmj.2004.021527 VO 80 IS 943 A1 Ernst, E YR 2004 UL http://pmj.bmj.com/content/80/943/249.abstract AB