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https://scholar.google.com/scholar_lookup?title=Zinc,%20ferritin,%20magnesium%20and%20copper%20in%20a%20group%20of%20Egyptian%20children%20with%20attention%20deficit%20hyperactivity%20disorder&author=Mahmoud,+M.M.&author=el-Mazary,+A.-A.M.&author=Maher,+R.M.&author=Saber,+M.M.&publication_year=2011&journal=Ital.+J.+Pediatr.&volume=37&pages=60&doi=10.1186/1824-7288-37-60