TY  - JOUR
T1  - VItamin d level, respiratory tract infections, and controlled trials
AU  - Hemilä H
Y1  - 2009/08/10
N1  - 10.1001/archinternmed.2009.246
JO  - Archives of Internal Medicine
SP  - 1443
EP  - 1443
VL  - 169
IS  - 15
N2  - 
Nutrition is associated with a wide range of lifestyle variables, and there is a great risk of residual confounding caused by inadequate adjustments for complex social and environmental exposures acting over a person’s life.2 Residual confounding may explain, for example, the divergent findings in observational studies and controlled trials on vitamin E.2 Therefore, great caution should be exercised when interpreting correlations between serum vitamin D levels and health outcomes.

SN  - 0003-9926
M3  - doi: 10.1001/archinternmed.2009.246
UR  - http://dx.doi.org/10.1001/archinternmed.2009.246
ER  -