Star rating system fails to reduce variation.
Kmietowicz
Zosia
Z
D030881:Disclosure; D006779:Hospitals, Public / Q000145:classification / Q000592:standards; D006801:Humans; D019984:Quality Indicators, Health Care / Q000706:statistics & numerical data; D012941:Social Responsibility; D013222:State Medicine / Q000145:classification / Q000592:standards*; D006113:United Kingdom