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EP-0,216,479
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EP-A-1,086,683
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EP-A-1,068,854
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EP-A-1,086,945
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WO-A-02/47031
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WO-93/23008
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EP-A-6,921,217
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EP-A-686,858
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US-A-5,472,798
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US-A-3,802,841
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FR-A-2,079,785
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US-3,915,921
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EP-A1-0,360,728
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EP-A-0,549,494
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US-4,509,949
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EP-A-0,951,897
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US-A-5,156,911
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WO-A-01/19333
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US-A-5,736,125
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US-A-5,519,063
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EP-A-550,745