Epigenetic DNA methylation changes associated with headache chronification: A retrospective case-control study. Winsvold BS, Palta P, Eising E, et al. Epigenetic DNA methylation changes associated with headache chronification: A retrospective case-control study. Cephalalgia. 2018;38(2):312-322. doi:10.1177/0333102417690111 Read more