TY  - RPRT
TI  - Electrophysiological testing of sinus node function.
AU  - A Helfgott
PY  - 1985
DO  - 10.1111/j.1540-8159.1985.tb05785.x
UR  - https://pubmed.ncbi.nlm.nih.gov/2582396/
ID  - 2582396
ER  -