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Perch M, Titlestad IL, Rychwicha-Kielek BA, Bendstrup E, Iversen M, Siemsen M, Jørgensen OD, Haahr PE.Perch M, et al. Among authors: haahr pe.Ugeskr Laeger. 2014 Jul 14;176(29):V01140005.Ugeskr Laeger. 2014.PMID: 25292200Free article.Review.Danish.