TY  - RPRT
TI  - Serial exercise testing in pulmonary embolism.
AU  - R A Helmers
AU  - D C Zavala
PY  - 1988
DO  - 10.1378/chest.94.3.517
UR  - https://pubmed.ncbi.nlm.nih.gov/3409730/
ID  - 3409730
ER  -