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Walker SP, Robinson RD, Powell CA, Grantham-McGregor SM.Walker SP, et al. Among authors: powell ca.Trans R Soc Trop Med Hyg. 1992 May-Jun;86(3):331-2. doi: 10.1016/0035-9203(92)90337-c.Trans R Soc Trop Med Hyg. 1992.PMID: 1412670No abstract available.
Grantham-McGregor S, Stewart M, Powell C.Grantham-McGregor S, et al.Dev Med Child Neurol. 1991 Aug;33(8):706-14. doi: 10.1111/j.1469-8749.1991.tb14948.x.Dev Med Child Neurol. 1991.PMID: 1916025