Determination of synthetic phosphodiesterase-5 inhibitors by LC-MS2 in waters and human urine submitted to dispersive liquid-liquid microextraction

1. Campillo, N.
2. Marín, J.
3. Fenoll, J.
4. Garrido, I.
5. López-García, I.
6. Hernández-Córdoba, M.
7. Viñas, P.