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Polish Journal of Surgery > 2013 > 85 > 9 > 491-495
Comparative Professional Pedagogy > 2013 > 85 > 9 > 491-495
Asian Journal of Surgery > 2012 > 35 > 3 > 99-103
International Journal of Radiation Oncology, Biology, Physics > 2009 > 75 > 1 > 129-136