The account for provider and center effects in multicenter interventional and surgical randomized controlled trials is in need of improvement: a review
| Autor: | Biau, David J., Porcher, Raphaël, Boutron, Isabelle |
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| Zdroj: | In Journal of Clinical Epidemiology 2008 61(5):435-439 |
| Databáze: | ScienceDirect |
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