参考文献:
Florjancic, Alan S. Dart, Michael J. Ryther, Keith B. Perez-Medrano, Arturo Carroll, William A. Patel, Meena V. Tietje, Karin Rosemarie Li, Tongmei Kolasa, Teodozyj Gallagher, Megan E. Peddi, Sridhar Frost, Jennifer M. Nelson, Derek W. Patent: US2008/58335 A1, 2008 Location in patent: Page/Page column 50-51