TY  - RPRT
TI  - Vertebral osteoporosis in ankylosing spondylitis.
AU  - C A Hanson
AU  - J W Shagrin
AU  - H Duncan
PY  - 1971
UR  - https://pubmed.ncbi.nlm.nih.gov/5540407/
ID  - 5540407
ER  -