Studies of Birth Order Without Control Group in a Systematic Review, up to 2012.
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Abbreviations: df, degree of freedom; HCC, hepatocellular carcinoma. aWhen age range was not available, study was categorized as children (<20 years old), adults (≥20 years old) or both children and adults. aRatio of observed/expected number is presented.
创建时间：
2013-07-19
