1Leiden University Medical Center (LUMC), Department of Clinical Epidemiology, C0-P, PO Box 9600, 2300 RC Leiden, The Netherlands. rosendaal@mail.medfac.leidenuniv.nl
Randomized trials and observational studies, like case-control studies, can complement each other. Case-control studies inform future randomized trials, especially for etiological research.
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