| http://www.w3.org/ns/prov#value | - , although four subsequent studies found no association between these drug exposures and childhood brain tumors (Carozza et al.,1995; McKean-Cowdin et al.,2003; Cardy et al.,2006) or neuroblastoma (Cook et al.,2004).Exposure measurement was a limitation in previous epidemiologic studies of prenatal exposures of nitrosatable drugs.
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