- Folic acid intake and spina bifida in the era of dietary folic acid fortificationKatherine Ahrens
Slone Epidemiology Center, Boston University, Boston, MA 02215, USA
Epidemiology 22:731-7. 2011..We evaluated whether intake of folic acid from supplements and diet was associated with a reduction in spina bifida in the setting of folic acid fortification...
- Correcting for exposure misclassification using survival analysis with a time-varying exposureKatherine Ahrens
Slone Epidemiology Center at Boston University, MA, USA
Ann Epidemiol 22:799-806. 2012..Here we show how quantitative correction for exposure misclassification can be applied to a Cox regression model with a time-varying dichotomous exposure...