TY  - RPRT
TI  - Factors affecting colectomy rate in ulcerative colitis: an epidemiologic study.
AU  - C E Leijonmarck
AU  - P G Persson
AU  - G Hellers
PY  - 1990
DO  - 10.1136/gut.31.3.329
UR  - https://pubmed.ncbi.nlm.nih.gov/2323599/
ID  - 2323599
ER  -