Evidence of selection bias in preterm survival studies: a systematic review

Archives of Disease in Childhood: Fetal and Neonatal Edition - Tập 84 Số 2 - Trang 79F-84 - 2001
David J Evans1, Malcolm I. Levene1
1Centre for Reproduction, Growth and Development, University of Leeds, D Floor Clarendon Wing, The General Infirmary at Leeds, Leeds LS2 9NS, UK.

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