TY  - GEN
AU  - Thomas,S
TI  - ECG File. First and second degree heart block
SN  - 0029-6570
PY  - 1990///1213
KW  - Electrocardiography
KW  - Heart Block
KW  - diagnosis
KW  - Humans
N1  - Publication Type: Journal Article
UR  - https://doi.org/10.7748/ns.5.4.40.s43
ER  -