Complainers and noncomplainers.
D000554:Ambulatory Care Facilities / Q000592:standards*; D001900:Boston; D003258:Consumer Behavior; D003710:Demography; D005069:Evaluation Studies as Topic; D005246:Feedback; D006268:Health Facilities / Q000592:standards*; D006269:Health Facilities, Proprietary / Q000592:standards*; D009096:Multi-Institutional Systems / Q000592:standards*; D013223:Statistics as Topic