1. Porter, M. E., & Teisberg, E. O. (2006). Redefining health care: Creating value-base competition on results. Boston: Harvard Business School Publishing.
2. Skevington, S. M., Lotfy, M., O’Connell, K. A., & WHOQOL Group. (2004). The World Health Organization’s WHOQOL-BREF quality of life assessment: Psychometric properties and results of the international field trial. A report from the WHOQOL group. Quality of Life Research, 13(2), 299–310.
3. Chen, W. C., Wang, J. D., Hwang, J. S., Chen, C. C., Wu, C. H., & Yao, G. (2009). Can the web-form WHOQOL-BREF be an alternative to the paper-form? Social Indicators Research, 94, 97–114.
4. Institute for Strategy and Competitiveness, Harvard Business School. (2007). Value-based competition. Accesses 16 January 2009 from: http://www.hbs.edu/rhc/value.html .
5. National Institute of Occupational Safety and Health (NIOSH). (2002). Violence: Occupational hazards in hospitals. Washington, DC: NIOSH.