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Scaling and norming. Kolen,M.J. Educational Measurement . 2006
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Micronutrient Deficiencies and Developmental Delays among Infants:Evidence from a Cross-Sectional Survey in Rural China. Renfu Luo,Yaojiang Shi,Huan Zhou,Ai Yue,Linxiu Zhang,Sean Sylvia,Alexis Medina,Scott Rozelle. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4611485/ . 2017