TY  - RPRT
TI  - Effect of coding changes on ulcer incidence trends.
AU  - T M Vogt
AU  - R E Johnson
PY  - 1984
DO  - 10.2105/ajph.74.3.271
UR  - https://pubmed.ncbi.nlm.nih.gov/6696162/
ID  - 6696162
ER  -