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4912755 | Blood et al. | Mar 1990 | |
4922516 | Butler et al. | May 1990 | |
4977399 | Price et al. | Dec 1990 | |
5357557 | Sakakura | Oct 1994 | |
5359647 | Regen et al. | Oct 1994 | |
5398276 | Lemke et al. | Mar 1995 |
Entry |
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