Article,

Workshop 4--Sources of bias in case-referent studies.

, and .
Hong Kong medical journal = Xianggang yi xue za zhi / Hong Kong Academy of Medicine, 18 (1): 46-7 (February 2012)6631<m:linebreak></m:linebreak>JID: 9512509; ppublish;<m:linebreak></m:linebreak>Critical appraisal.

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