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Mozhgan Derakhshan Sefidi, Iraj Rasooli, Parviz Owlia, Daryush Talei, Shakiba Darvish Alipour Astaneh, Shahram Nazarian 
World J Methodol 6(3):190-199. Published online Sep 26, 2016. doi: 10.5662/wjm.v6.i3.190