“…The comparison of essential trace (Cu, Fe and Zn) in referent subjects with reported literature data is presented in Table 7. The concentrations of zinc in scalp hair samples of referent subjects, found in present study, are comparable with Poland, Sudan, Italy, Pakistan and Syria studies [[78], [79], [80], [81], [82]], whilst higher than Ahmad et al, 2011 [83] and Pasha et al, 2010studies [84]. These findings are higher than Suliburska, 2011 study [85].…”