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DOI

10.1136/bmj.315.7103.305

Type

Journal article

Publication Date

1997-08-02T00:00:00+00:00

Volume

315

Pages

305 - 308

Total pages

3

Keywords

Case-Control Studies, Clinical Trials as Topic, Cohort Studies, Follow-Up Studies, Patient Selection, Publishing, Research Design, Sampling Studies, Selection Bias