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Stavros Gkolfinopoulos, Konstantinos Tsapakidis, Konstantinos Papadimitriou, Demetris Papamichael, Panteleimon Kountourakis 
World J Methodol 7(1):9-15. Published online Mar 26, 2017. doi: 10.5662/wjm.v7.i1.9
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