参考文献:
PFIZER INC. EDWARDS, Martin Paul KUMPF, Robert Arnold KUNG, Pei-Pei MCAPLINE, Indrawan James NINKOVIC, Sacha RUI, Eugene Yuanjin SUTTON, Scott Channing TATLOCK, John Howard WYTHES, Martin James Zehnder, Luke Raymond Patent: US04/79667 A, 04 Location in patent: Page/Page column