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Rates of recruitment from systematic and opportunistic methods: preliminary results from the DDELPHI study
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| Formato: | Online Artículo Texto |
| Lenguaje: | English |
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BioMed Central
2011
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| Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3287685/ http://dx.doi.org/10.1186/1745-6215-12-S1-A112 |