Kfinder, - PubMed Third Party Tools
Kfinder, takes an abstract or other text as the input, and suggests keywords based on the frequency of occurrence of improbable words. You select keywords, and it returns researchers who match that search in Medline at least twice. Kfinder is quite slow and limited to Medline, but it is intuitive, and a good start to selecting keywords if you haven't had much practice.
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