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S Seidel, S Frantal, P Oberhofer, T Bauer, N Scheibel, F Albert, T Casjens, G Klösch, J Zeitlhofer, C Wöber. "Darling, the doctor says I slept well but I still have headache in the morning: an actigraphic study in couples." The Journal of Headache and Pain 14.S1 (2013)