Clarke AR, Goddu AP, Nocon RS, Stock NW, Chyr LC, Akuoko JA, Chin MH. Thirty years of disparities intervention research: what are we doing to close racial and ethnic gaps in health care?. Med Care. 2013 Nov;51(11):1020-6. PubMed PMID: 24128746;PubMed Central PMCID: PMC3826431