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Needs Assessment refugee public health service economics health care policy human risk assessment comorbidity Refugees statistics and numerical data outpatient care procedures health care cost Health Care Costs Humans undocumented immigrant Editorial Severity of Illness Index hemodialysis Renal Dialysis organization and management health care access New Zealand developed country Delivery of Health Care chronic kidney failure medical care Renal Insufficiency, Chronic gold standard health practitioner therapy effect health care delivery