We conducted a systematic review of the peer-reviewed literature published from 1 January 1987 to 1 September 2007 in all languages using PubMed and EMBASE.
The paper mainly introduces the network database retrieval system of EMBASE, and explores the characteristics, retrieval way, retrieval methods and management of retrieval results.
METHODS: the search for relevant observational studies was undertaken in the MEDLINE, EMBASE, and Scopus electronic databases, as well as in the proceedings of major gastroenterology meetings.