The Relationship of DNA Methylation with Age, Gender and Genotype in Twins and Healthy Controls Boks, Marco P. ; Derks, Eske M. ; Weisenberger, Daniel J. ; Strengman, Erik ; Janson, Esther ; Sommer, Iris E. ; Kahn, René S. ; Ophoff, Roel A. Abstract Publication: PLoS ONE Pub Date: August 2009 DOI: 10.1371/journal.pone.0006767 Bibcode: 2009PLoSO...4.6767B