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al PMA results. The overall data for meta-analysis will be held, analysed and published by the collaborative group, led by the Cochrane PMA group. CRD42020103857. CRD42020103857. This study aimed to set a data-driven achievable performance benchmark, explore the process-outcome association and speculate about the net gain in quality improvement with benchmarking. Observational study. Patient survey conducted at 466 secondary and tertiary hospitals across 31 provinces, autonomous regions and municipalities in China. 183 334 patients diagnosed with chronic he