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 Music therapy 

I just saw an edit to the article on Music therapy in which the editor removed three articles that had been added.  The edit summary says, ""rm drury COI"".  I suppose ""rm"" means ""removed"", and ""drury"" is the last name of the one of the articles' authors (lower-case), but what is ""COI""?  Also, why were the articles removed?  Just trying to learn something.  "