“…There were 35 studies concerning children over 6 years old, and these also measured manganese in related biomarkers, such as hair ( n = 24) [ 6 – 8 , 15 , 16 , 21 , 22 , 43 , 45 , 46 , 49 , 51 – 54 , 59 – 63 , 65 – 68 ], blood ( n = 17) [ 6 , 7 , 9 , 21 , 44 , 49 , 52 , 53 , 56 – 60 , 63 – 65 , 67 ], teeth ( n = 5) [ 42 , 47 , 48 , 50 , 55 ], saliva, toe nail [ 8 ] and urine [ 60 ]. One study could be included when using more than one biomarker, as was the case in New Brunswick (Canada), which measured manganese in hair, saliva and toe nail [ 8 ].…”