参考文献:
D'Sidocky, Neil R. Harris, Roy L. Hegde, Sayee G. Hilgraf, Robert McCarrick, Margaret A. McKie, Jeffrey A. Mortensen, Deborah S. Nadolny, Lisa Perin-Ninkovic, Sophie M. Sapienza, John J. Wright, Jonathan L. Patent: US8/4694 A1, 8 Location in patent: Page/Page column 5 US 84694 A1