1. U.S. Census Bureau, Decennial Census Data and Population Projections (August 14, 2008), www.census.gov/population/www/projections/files/nation/summary/np2008-t1.xls
2. Kurtz, S., Ong, K., Lau, E., Mowat, F., Halpern, M.: Projections of Primary and Revision Hip and Knee Arthroplasty in the United States from 2005 to 2030. J. Bone Joint Surg. Am. 89, 780–785 (2007)
3. Choi, J.H.J., Blueter, J., Fahey, B., Leonard, J., Omilanowski, T., Riley, V., Schauer, M., Sulli-van, M., Krebs, V., Schaffer, J.: Optimization of Perioperative Processes Through Innovation and Technology for the Orthopaedic Operating Room of the Future. Cleveland Clinic J. of Med. 74(esuppl. 1), S26 (2007)
4. Schaffer, J.L., Bozic, K.J., Dorr, L.D., Miller, D.A., Nepola, J.V.: Direct-to-Consumer Marketing in Orthopaedic Surgery: Boon or Boondoggle. Journal of Bone and Joint Surgery 90, 2534–2543 (2008)
5. Wickramasinghe, N., von Lubitz, D.: Knowledge-based Enterprise Theories and Fundamentals. IGI, Hersey (2007)