TY  - RPRT
TI  - Three reasons for ulcerative colitis.
AU  - G A MacGregor
PY  - 1973
DO  - 10.1016/s0140-6736(73)90622-3
UR  - https://pubmed.ncbi.nlm.nih.gov/4121240/
ID  - 4121240
ER  -