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  1. 1
    Jörgen Rovers, Marcel Smits, Jeanne F. Duffy, Headache and Sleep: Also Assess Circadian Rhythm Sleep Disorders, Headache: The Journal of Head and Face Pain, 2014, 54, 1
  2. 2
    Thomas Freedom, Headache and Sleep: Also Assess Circadian Rhythm Sleep Disorders: A Response, Headache: The Journal of Head and Face Pain, 2014, 54, 1