Der er forskjellige felter det søkes i ved .tw.-søk i OVID:
§MEDLINE: ti, ab
§EMBASE: ti, ab, tn
§PsycINFO: ti, ab, id, tc
§AMED: ti, ab, hw
EMBASE: TN=Drug Trade Name (the trade name for a drug or device discussed in an article)
PsycINFO: ID=Key Concepts (keywords added by indexers); TC=Table of Contents (exists in book records)
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