参考文献:
Li, Guiying Peterson, John M. Albaugh, Pamela Currie, Kevin S. Cai, Guolin Gustavson, Linda M. Lee, Kyungae Hutchison, Alan Singh, Vinod Maynard, George D. Yuan, Jun Xie, Ling Hong Ghosh, Manuka Liu, Nian Luke, George P. Mitchell, Scott Allen, Martin Patrick Liras, Spiros Patent: US2003/69257 A1, 2003 US 20030069257 A1