Humans Primary Health Care Referral and Consultation human patient referral primary health care Age Factors Allied Health Personnel Child Child, Preschool Childsmile Cohort Studies Community health worker Dental Care for Children Dental public health Health Services Accessibility Health inequality Infant Information Storage and Retrieval Lay health worker Mass Media Mouth Neoplasms Oral health Proportional Hazards Models Risk Factors Scotland Support worker, dental practice Vulnerable Populations age article