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Colon cancer controls versus population controls in case-control studies of occupational risk factors
BACKGROUND: Since updated population registers do not exist in many countries it is often difficult to sample valid population controls from the study base to a case-control study. Use of patient controls is an alternative option if the exposure experience under study for these patients are intercha...
| Autores principales: | , , , |
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| Formato: | Texto |
| Lenguaje: | English |
| Publicado: |
BioMed Central
2004
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| Materias: | |
| Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC415553/ https://www.ncbi.nlm.nih.gov/pubmed/15102323 http://dx.doi.org/10.1186/1471-2407-4-15 |