Complex comorbidities of recurrent headache disorders: Introduction to the special series
Penzien, D.B., Rains, J.C., Lake, A.E, Lipchik, G.L., Lipton, R.B., & Saper, J.R. . Complex comorbidities of recurrent headache disorders: Introduction to the special series. Headache. 2006; 46(9):1364-1376.