“…The main limitations of this review were that 10 authors [3,7,8,14,15,17,23,24,26,27] used a low number (< 10) of patients (it was decided in this review that < 10 will indicate a low number of patients), nine authors [2,7,10,14,15,18,23,24,27] used only one ND evaluation method and 4 authors [8,16,17,26] failed to mention the ND evaluation method. Eight authors [2][3][4]16,17,24,26,27] selected the patients randomly.…”