TY  - RPRT
TI  - Graded exercise testing in patients with sinus node dysfunction.
AU  - J A Abbott
AU  - D S Hirschfeld
AU  - F W Kunkel
AU  - M M Scheinman
AU  - G Modin
PY  - 1977
DO  - 10.1016/0002-9343(77)90829-4
UR  - https://pubmed.ncbi.nlm.nih.gov/842552/
ID  - 842552
ER  -