Colon cancer controls versus population controls in case-control studies of occupational risk factors
<p>Abstract</p> <p>Background</p> <p>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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
BMC
2004-04-01
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| Series: | BMC Cancer |
| Subjects: | |
| Online Access: | http://www.biomedcentral.com/1471-2407/4/15 |