Irritable bowel syndrome: are incentives useful for improving survey response rates?
| Autor: | Patten, Scott B, Li, Feng Xiao, Cook, Tim, Hilsden, Robert J, Sutherland, Lloyd R |
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| Zdroj: | In Journal of Clinical Epidemiology 2003 56(3):256-261 |
| Databáze: | ScienceDirect |
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