1
Published 2014
National Academies Press
... also has endogenous sources--it is produced intracellularly as a component of the one carbon pool...

2
Published 2008
Royal College of Physicians

3
Published 2014
The National Academies Press
..., severity, frequency of symptoms, and exclusionary criteria to produce a more robust case definition...

4
by Alper, Joe
Published 2015
National Academies Press