参考文献

Bissantz, Caterina; Goetschi, Erwin; Grundschober, Christophe; Masciadri, Raffaello; Ratni, Hasane; Rogers-Evans, Mark; Schnider, Patrick Patent: US2008/171759 A1, 2008 ; Location in patent: Page/Page column 20 ; US 20080171759 A1