GSTM1 and anemia (phenotype): According to the World Health Organization [159], diagnosis of anemia utilizing Hb concentrations have cutoff criteria of <115 g·L−1 for ages 5 to 11 years, <120 g·L−1 for ages 12–14 years, and <120 g·L−1 and 130 g·L−1 for females and males, respectively, 15 years or older [159,162].