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D260346 | Lebowitz | Aug 1981 | S |
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5562025 | Bull et al. | Oct 1996 | A |
5865109 | Bull | Feb 1999 | A |
5904090 | Lillelund et al. | May 1999 | A |
6622618 | Glucksman et al. | Sep 2003 | B1 |