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Ferrari U, Empl M, Kim KS, Sostak P, Förderreuther S, Straube A.Ferrari U, et al. Among authors: empl m.Headache. 2005 Mar;45(3):211-4. doi: 10.1111/j.1526-4610.2005.05046.x.Headache. 2005.PMID: 15836594
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Empl M, Sostak P, Riedel M, Schwarz M, Müller N, Förderreuther S, Straube A.Empl M, et al.Cephalalgia. 2003 Feb;23(1):55-8. doi: 10.1046/j.1468-2982.2003.00453.x.Cephalalgia. 2003.PMID: 12534582
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