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salman khazaei - department of epidemiology and biostatistics, school of public health, hamadan university of medical sciences, hamadan, ir iran
hamid salehiniya - minimally invasive surgery research center, iran university of medical sciences, tehran, ir iran; department of epidemiology and biostatistics, school of public health, tehran university of medical sciences, tehran, ir iran; department of epidemiology and biostatistics, school of public health, tehran university of medical sciences, tehran, ir iran
mohammad keshvari delavar - hamadan university of medical sciences, hamadan, ir iran
abdollah mohammadian hafshejani - department of epidemiology and biostatistics, school of public health, isfahan university of medical sciences, isfahan, ir iran
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