TY  - RPRT
TI  - An abnormal echo-free space behind the left atrium.
AU  - David Sidebotham
AU  - James Lai
PY  - 2004
DO  - 10.1053/j.jvca.2004.07.021
UR  - https://pubmed.ncbi.nlm.nih.gov/15578486/
ID  - 15578486
ER  -