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Biering-Sørensen F, Gregersen H, Hagen E, Haugland M, Keith M, Larsen CF, Leicht BP, Nielsen FH, Rabischong E, Sinkjaer T.Biering-Sørensen F, et al. Among authors: gregersen h.Ugeskr Laeger. 2000 Apr 10;162(15):2195-8.Ugeskr Laeger. 2000.PMID: 10776066Review.Danish.