TY  - RPRT
TI  - Second-degree atrioventricular block and the haystack principle.
AU  - David H Spodick
DO  - 10.1111/j.1076-7460.2006.05070.x
UR  - https://pubmed.ncbi.nlm.nih.gov/16415651/
ID  - 16415651
ER  -