TY  - RPRT
TI  - [Indications for closed mitral valvotomy using microcatheterization].
AU  - M Niederberger
AU  - K Steinbach
AU  - F Unger
PY  - 1973
UR  - https://pubmed.ncbi.nlm.nih.gov/4700178/
ID  - 4700178
ER  -