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by Cohen, I. Glenn; Hoffman, Allison; Sage, William M.; et al.
by Cohen, William I.; Nadel, Lynn; Madnick, Myra E.
by Weeks, William Earl; Cohen, Warren I.; Lafeber, Walter; et al.
by Editor: William I. Cohen (Child Development Unit, Children's Hospital of Pittsburgh); Editor: Lynn Nadel (Department of Psychology, University of Arizona); Editor: Myra E. Madnick (National Down Syndrome Society)
by Schwartz, M. William; Bell, Louis M.; Bingham, Peter M.; et al.