1. Wulczyn, F., Barth, R.P., Yuan, Y.Y., Jones-Harden, B., & Landsverk, J. (2005). Evidence for child welfare policy reform. New York: Transaction De Gruyter.
2. Established risk conditions include, but are not limited to, chromosomal abnormalities; genetic or congenital disorders; severe sensory impairments, including hearing and vision; inborn errors of metabolism; disorders reflecting disturbance of the development of the nervous system; congenital infections; disorders secondary to exposure to toxic substances, including fetal alcohol syndrome; and severe attachment disorders.