TY  - RPRT
TI  - Letter: First and second versus second and third exercise tests.
AU  - D H Spodick
PY  - 1975
DO  - 10.1161/01.cir.51.2.394
UR  - https://pubmed.ncbi.nlm.nih.gov/1078648/
ID  - 1078648
ER  -