参考文献

MADDAFORD, Shawn; RAMNAUTH, Jailall; RAKHIT, Suman; PATMAN, Joanne; ANNEDI, Subhash C.; ANDREWS, John; DOVE, Peter; SILVERMAN, Sarah; Renton, Paul Patent: US2008/234237 A1, 2008 ; Location in patent: Page/Page column 74 ; US 20080234237 A1