TY  - RPRT
TI  - HLA 27 positive, negative, or both?
AU  - A Calin
AU  - M Barnett
PY  - 1980
DO  - 10.1056/nejm198006123022418
UR  - https://pubmed.ncbi.nlm.nih.gov/7374690/
ID  - 7374690
ER  -