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Fichtel A, Larsson B.Fichtel A, et al. Among authors: larsson b.Headache. 2002 Sep;42(8):766-75. doi: 10.1046/j.1526-4610.2002.02178.x.Headache. 2002.PMID: 12390639
Fichtel A, Larsson B.Fichtel A, et al. Among authors: larsson b.Headache. 2004 Jun;44(6):545-54. doi: 10.1111/j.1526-4610.2004.446002.x.Headache. 2004.PMID: 15186298Clinical Trial.
Larsson B, Dahlöf C, Eeg-Olofson O, Fichtel A, Laurell K.Larsson B, et al.Lakartidningen. 2007 Jun 4-11;104(23):1802-5.Lakartidningen. 2007.PMID: 17655026Review.Swedish.No abstract available.