TY  - RPRT
TI  - Lower esophageal ring.
AU  - M K BARTLETT
AU  - P KRAMER
PY  - 1963
DO  - 10.1056/nejm196305232682121
UR  - https://pubmed.ncbi.nlm.nih.gov/13969701/
ID  - 13969701
ER  -