(Q48573852)
Statements
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Introduction to propensity scores: A case study on the comparative effectiveness of laparoscopic vs open appendectomy (English)
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Mark R Hemmila
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Nancy J Birkmeyer
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Saman Arbabi
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Nicholas H Osborne
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Wendy L Wahl
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Justin B Dimick
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1 October 2010
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145
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10
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939-945
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