Selection bias and the use of controls with malformations in case-control studies of birth defects. [electronic resource]
Producer: 19990614Description: 238-41 p. digitalISSN:- 1044-3983
- Boston -- epidemiology
- Case-Control Studies
- Cleft Lip -- epidemiology
- Cleft Palate -- epidemiology
- Congenital Abnormalities -- epidemiology
- Environmental Exposure -- adverse effects
- Female
- Humans
- Infant, Newborn
- Ontario -- epidemiology
- Philadelphia -- epidemiology
- Population Surveillance
- Pregnancy
- Pregnancy Complications
- Pregnancy Trimester, First
- Prevalence
- Research Design
- Risk Factors
- Selection Bias
- Smoking -- adverse effects
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Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.
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