Towards an ICF-based clinical measure of functioning in people with ankylosing spondylitis...
Cieza A, Hilfiker R, Boonen A, van der Heijde D, Braun J, Stucki G. Towards an ICF-based clinical measure of functioning in people with ankylosing spondylitis: a methodological exploration. Disabil Rehabil. 2009;31(7):528-37. Abstract