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Open Access to Trials Register
| Autor principal: | |
|---|---|
| Formato: | Texto |
| Lenguaje: | English |
| Publicado: |
Public Library of Science
2005
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| Materias: | |
| Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC549596/ https://www.ncbi.nlm.nih.gov/pubmed/15737004 http://dx.doi.org/10.1371/journal.pmed.0020049 |