Pallidal Index as Biomarker of Manganese Brain Accumulation and Associated with Manganese Levels in Blood: A Meta-Analysis. - Li, Shao-Jun; Jiang, Li; Fu, Xue; Huang, Shuang; Huang, Yan-Ni; Li, Xiang-Rong; Chen, Jing-Wen; Li, Yong; Luo, Hai-Lan; Wang, Fang; Ou, Shi-Yan; Jiang, Yue-Ming (PLoS ONE, 2014)