Melatonin Effects in Methylphenidate Treated Children with Attention Deficit Hyperactivity Disorder: A Randomized Double Blind Clinical Trial - Mohammadi, Mohammad Reza; Mostafavi, Seyed Ali; Keshavarz, Seyed Ali; Eshraghian, Mohammad Reza; Hosseinzadeh, Payam; Hosseinzadeh-Attar, Mohammad Javad; Kooshesh, Seyed Mohammad Ali; Chamari, Maryam; Akhondzadeh, Shahin (Iranian Journal of Psychiatry)