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https://scholar.google.com/scholar_lookup?title=Zinc%20sulfate%20as%20an%20adjunct%20to%20methylphenidate%20for%20the%20treatment%20of%20attention%20deficit%20hyperactivity%20disorder%20in%20children:%20A%20double%20blind%20and%20randomized%20trial&author=Akhondzadeh,+S.&author=Mohammadi,+M.R.&author=Khademi,+M.&publication_year=2004&journal=BMC+Psychiatry&volume=4&pages=90