Author(s): Vogler BK
The authors searched the electronic databases of MEDLINE, EMBASE, BIOSIS Previews, CISCOM, and the Cochrane Library from the database's inception to September 1998 using the search terms 'ginseng', 'panax' and 'eleutherococcus'. The authors also searched the bibliographies of retrieved studies and scanned personal files. Manufacturers of commercial ginseng products were contacted for further information and experts of herbal medicine were also contacted to provide published and unpublished material. There were no language restrictions.