title: Letter: Changes in annual incidence rates of sudden unexpected deaths among infants in Philadelphia, 1960-1972.
mesh_terms: D000704:Analysis of Variance; D044383:Black People; D003644:Death Certificates; D003645:Death, Sudden; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D044469:Racial Groups; D044465:White People