参考文献

Brotherton-Pleiss, Christine E.; Harris, III, Ralph New; Loe, Bradley E.; Lopez-Tapia, Francisco Javier; Rege, Pankaj D.; Repke, David Bruce; Stabler, Russell Stephen; Walker, Keith Adrian Murray Patent: US2011/71143 A1, 2011 ; Location in patent: Page/Page column 37 ;