TY  - RPRT
TI  - The electrocardiogram in old age.
AU  - P HAGEN
AU  - Z FREEMAN
PY  - 1950
DO  - 10.5694/j.1326-5377.1950.tb80465.x
UR  - https://pubmed.ncbi.nlm.nih.gov/15416377/
ID  - 15416377
ER  -