Danish national recommendations and/or guidelines
Pedersen SJ, Madsen OR, Erlendsson J, Schiøttz-Christensen B, Sørensen IJ, Andersen LS, Ostergaard M. [Danish recommendations on treatment of ankylosing spondylitis and spondyloarthritis based on multinational project initiative]. Ugeskr Laeger. 2008;170:4044-50.
International recommendations and/or guidelines