TY  - RPRT
TI  - Endoscopic retrograde cholangiography.
AU  - M O Blackstone
AU  - A L Blum
PY  - 1977
DO  - 10.1007/bf01071899
UR  - https://pubmed.ncbi.nlm.nih.gov/855857/
ID  - 855857
ER  -