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Rosenberg-Nordmann M, Berthele A, Tölle TR, Sprenger T.Rosenberg-Nordmann M, et al. Among authors: berthele a.Nervenarzt. 2009 Dec;80(12):1417-23. doi: 10.1007/s00115-009-2711-7.Nervenarzt. 2009.PMID: 19367384Review.German.
Seifert CL, Woeller A, Valet M, Zimmer C, Berthele A, Tölle T, Sprenger T.Seifert CL, et al. Among authors: berthele a.Headache. 2008 Mar;48(3):448-52. doi: 10.1111/j.1526-4610.2007.00965.x. Epub 2007 Nov 13.Headache. 2008.PMID: 18005138