% 21460457 
@Article{pmid21460457,
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% 15572783 
@Article{pmid15572783,
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% 12393928 
@Article{pmid12393928,
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% 18094475 
@Article{pmid18094475,
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% 21460441 
@Article{pmid21460441,
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% 15572778 
@Article{pmid15572778,
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