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