Health services: shadows in the valleys.
D000368:Aged; D003032:Coal Mining; D003153:Community Health Services / Q000458:organization & administration*; D003710:Demography; D006299:Health Services for the Aged / Q000600:supply & distribution*; D006801:Humans; D011787:Quality of Health Care; D012959:Socioeconomic Factors; D014852:Wales