Phosphodiesterases PDE3 and PDE4 jointly control the inotropic effects but not chronotropic effects of ( − )-CGP12177 despite PDE4-evoked sinoatrial bradycardia in rat atrium - Galindo-Tovar, A; Vargas, M L; Kaumann, A J (Naunyn-Schmied Arch Pharmacol, 2008)