Validation of the Chronic Daily Headache Questionnaire (CDH-Q)F25Liebenstein, M.Bigal, M.Sheftell, F.Tepper, S.Rapoport, A.Lipton, R.Author information1Montefiore Headache Center, Bronx, NY, USA2New England Center for Headache, Stamford, CT, USAHeadache 47(5):p 760-761, May 2007.Copyright © 2007 Blackwell Publishing Ltd.