Practice-based research networks answer primary care questions.
Ambulatory Sentinel Practice Network, Denver, Colo 80214, USA. paul.nutting@ASPN.amc.org
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Nutting
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Beasley
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Werner
D002986:Clinical Trials as Topic; D005194:Family Practice / Q000592:standards*; D006302:Health Services Research; D007753:Laboratories; D011320:Primary Health Care / Q000458:organization & administration; D011787:Quality of Health Care; D012106:Research / Q000639:trends*; D014481:United States