TY  - RPRT
TI  - Echocardiographic contrast studies: initial experience.
AU  - J B Seward
AU  - A J Tajik
AU  - J G Spangler
AU  - D G Ritter
PY  - 1975
UR  - https://pubmed.ncbi.nlm.nih.gov/1123933/
ID  - 1123933
ER  -