Periaqueductal grey matter dysfunction in migrainecause or the burden of illness?Welch, K. M.Nagesh, V.Aurora, S.Gelman, N.Author information1Neurology, University of Kansas, Kansas City, KS, USA,2Neurology, Henry Ford Health Science Center, Detroit, MI, USA3Neurology, Swedish Headache Center, Swedish Neurosciences Institute, Seattle, WA, USACephalalgia 21(4):p 281, May 2001.Copyright © 2001 Blackwell Science Ltd.