Chin MH, Cook S, Drum ML, Jin L, Guillen M, Humikowski CA, Koppert J, Harrison JF, Lippold S, Schaefer CT: Improving diabetes care in midwest community health centers with the Health Disparities Collaborative. Diabetes Care 27:2–8, 2004

On p. 3 of the above-listed manuscript, the Institute for Healthcare Improvement was incorrectly acknowledged as developing the model for improvement, or Plan, Do, Study, Act (PDSA). It was actually developed by Associates in Process Improvement (Langley G, Nolan KM, Nolan TW, Norman CL, Provost LP: The Improvement Guide: A Practical Approach to Enhancing Organizational Performance. San Francisco, CA, Jossey-Bass, 1996).