TY  - RPRT
TI  - Open heart operations in the elderly: changing risk parameters.
AU  - R Pifarré
PY  - 1993
DO  - 10.1016/0003-4975(93)91138-d
UR  - https://pubmed.ncbi.nlm.nih.gov/8239841/
ID  - 8239841
ER  -