PSU20 IS THERE INDICATION BIAS OF RETROSPECTIVE OBSERVATIONAL STUDY?
Abstract
Authors
J.E. Choi E.J. Jang S.Y. Jung E.J. Lee N.R. Lee C.K. Joo
J.E. Choi E.J. Jang S.Y. Jung E.J. Lee N.R. Lee C.K. Joo
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