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2. Watson JB (1928) Psychological Care of Infant and Child (Norton, New York).
3. Hospitalism: An inquiry into the genesis of psychiatric conditions in early childhood;Spitz;Psychoanal Study Child,1945
4. Attachments across the life span;Ainsworth;Bull NY Acad Med,1985
5. U.S. Department of Health and Human Services (2001) Child Maltreatment: Reports from the States to the National Child Abuse and Neglect Data System (U.S. Government Printing Office, Washington, DC).