Chronic Migraine
BMJ 348:g141b, Schwedt, T.J., 2014
Chronic Daily Headache
NEJM 354:158-165, Dodick,D.W., 2006
Caffeine as a Risk Factor for Chronic Daily Headache, A Population-Based Study
Neurol 63:2022-2027, Scher,A.I.,et al, 2004
Analgesic Use: A Predictor of Chronic Pain and Medication Overuse Headache
Neurol 61:160-164,154, Zwart,J.-A.,et al, 2003