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Zhen, Huiling and McDermott, Suzanne and Lawson, Andrew B. and Aelion , Marjorie (2009) Are clusters of mental retardation correlated with clusters of developmental delay? Geospatial health , 4 (1). pp. 17-26. ISSN 1970-7096
Zhen, Huiling and Lawson, Andrew B. and McDermott, Suzanne and Lamichhane, Archana Pande and Aelion, Marjorie (2008) A spatial analysis of mental retardation of unknown cause and maternal residence during pregnancy. Geospatial health , 2 (2). pp. 173-182. ISSN 1970-7096