The case-control study and retrospective controls.

The case-control study and retrospective controls.

Mann, J I, Vessey, M P
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Volume:
2
Language:
english
Journal:
BMJ
DOI:
10.1136/bmj.2.6203.1507-a
Date:
December, 1979
File:
PDF, 230 KB
english, 1979
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