TY  - RPRT
TI  - Ankylosing spondylitis--experience with a self administered questionnaire: an analytical study.
AU  - V S Ringsdal
AU  - J J Andreasen
PY  - 1989
DO  - 10.1136/ard.48.11.924
UR  - https://pubmed.ncbi.nlm.nih.gov/2596883/
ID  - 2596883
ER  -