TY  - RPRT
TI  - Sildenafil.
AU  - C G McMahon
PY  - 2000
DO  - 10.5694/j.1326-5377.2000.tb125557.x
UR  - https://pubmed.ncbi.nlm.nih.gov/10772598/
ID  - 10772598
ER  -