Control of confounding requires specification of risk periods
Epidemiology
.
1993 Nov;4(6):556-7.
doi: 10.1097/00001648-199311000-00014.
Authors
C Thijs
,
P Leffers
,
P Knipschild
PMID:
8268287
DOI:
10.1097/00001648-199311000-00014
No abstract available
Publication types
Letter
Comment
MeSH terms
Case-Control Studies
Cholelithiasis / epidemiology
Cholelithiasis / etiology
Confounding Factors, Epidemiologic*
Female
Humans
Incidence
Odds Ratio
Pregnancy
Risk Factors
Smoking / adverse effects
Time Factors