1. The International Classification of Headache Disorders: 2nd ed. Cephalalgia, 2004;(24 Suppl. 1):9–160.
2. Prevalence of headache in an elderly population: attack frequency, disability, and use of medication;Prencipe;J Neurol Neurosurg Psychiatry,2001
3. Correlates of headache in a population-based cohort of elderly;Cook;Arch Neurol,1989
4. A survey of headache in an English city;Newland;Research & Clinical Studies in Headache,1978
5. Epidemiology of headache in elderly–correlations with life conditions and socio-professional environment;Serratrice;Headache,1985