Cochrane Filter for Humans only:
NOT (animals [mh] NOT humans [mh])
Duke Modified Cochrane Strategy for Randomized Trials in PubMed:
(randomized controlled trial[pt] OR controlled clinical trial[pt] OR randomized[tiab] OR randomised[tiab] OR randomization[tiab] OR randomisation[tiab] OR placebo[tiab] OR drug therapy[sh] OR randomly[tiab] OR trial[tiab] OR groups[tiab]) NOT (animals[mh] NOT humans[mh]) NOT (Editorial[pt] OR Letter[pt] OR Case Reports[pt] OR Comment[pt])
EMBASE:
limit to EMBASE records only -- [embase]/lim NOT [medline]/lim
