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NOTE: This study does NOT blame the parents of poor children. The problem
stems from poverty itself, which could be easily eliminated, and not only in the richer countries. It simply points out that - whatever the problem - children tend to be more resilient when they are lucky enough to have one or more loving caregivers.
BTW, the number of poor children is increasing in many countries, including England, Greece, the US, and Canada (British Columbia has the highest level of child poverty in Canada).