TY  - RPRT
TI  - Understanding the gastrointestinal system. Part 1.
AU  - E A Harald
AU  - K Kaufman
PY  - 1994
DO  - 10.1097/00152193-199407000-00030
UR  - https://pubmed.ncbi.nlm.nih.gov/8022576/
ID  - 8022576
ER  -