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Akhondzadeh, S., Mohammadi, M.-R., & Khademi, M. (2004). Zinc sulfate as an adjunct to methylphenidate for the treatment of attention deficit hyperactivity disorder in children: A double blind and randomized trial [ISRCTN64132371]. BMC Psychiatry, 4(1). doi:10.1186/1471-244x-4-9 
10.1186/1471-244X-4-9