1. National committee for quality assurance, Washington, DC. The state of managed care quality, CAHPS® 2.0H: purpose and methodology. Available online: http://www.ncqa.org/ (27 Sept 2005, date last accessed).
2. Goldstein, E., Cleary, P.D., Langwell, K.M., Zaslavsky, A.M., Heller, A.: Medicare managed care CAHPS: A tool for performance improvement. Hlth Care Fin Rev. 22, 101–107 (2001).
3. Westat, Rockville, M.D.: National CAHPS® benchmarking database: http://ncbd.cahps.org/Home/Index.asp (27 May 2004, date last accessed).
4. Landy, F.J., Farr, J.L.: Performance rating. Psychol Bull. 87, 72–107 (1980).
5. Lau, R.R., Sears, D.O., Centers, R.: The “positivity bias” in evaluations of public figures: evidence against instrument artifacts. Public Opin Q. 43, 347–358 (1979).