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They have been deprived nutritionally, or some illness has not been picked up, or they have not been screened for vision or hearing defects, or they have not had some kind of a chronic illness or error of metabolism picked up.
They have been deprived nutritionally, or some illness has not been picked up, or they have not been screened for vision or hearing defects, or they have not had some kind of a chronic illness or error of metabolism picked up.
