@article{haaga2007semiquantitative, title={Semiquantitative imaging measurement of baseline and vasomodulated normal prostatic blood flow using sildenafil}, author={Haaga, JR and Exner, A and Fei, B and Seftel, A}, journal={International journal of impotence research}, volume={19}, number={1}, pages={110}, year={2007}, publisher={Nature Publishing Group} }