1. Leapfrog Applauds Minnesota's Value-Based Healthcare Purchasing Initiative. Available at: http://www.leapfroggroup.org/news/leapfrog_news/3026350. Accessed February 18, 2009.
2. The Leapfrog Group Evidence-based Hospital Referral (EBHR) and Common Acute Conditions (CAC) Coding Specifications for Volume. Available at: https://leapfrog.medstat.com/pdf/volumestdcodes.pdf. Accessed February 18, 2009.
3. Empirically derived composite measures of surgical performance;Staiger;Med Care,2009
4. Composite measures for predicting hospital mortality with surgery;Dimick;Health Aff (Millwood),2009
5. Health plan quality-of-care information is undermined by voluntary reporting;Thompson;Am J Prev Med,2003