Letter: Piracetam and pyrithioxine.
D002648:Child; D002986:Clinical Trials as Topic; D006801:Humans; D007859:Learning Disabilities / Q000188:drug therapy*; D010889:Piracetam / Q000627:therapeutic use*; D010919:Placebos; D011760:Pyrrolidinones / Q000627:therapeutic use*
D010919:Placebos; D011760:Pyrrolidinones; D010889:Piracetam