Cornacchione, Marisa, et al. “PDE5 Inhibition Counteracts β- Adrenergic Induction of Cardiac Hypertrophy”. Italian Journal of Anatomy and Embryology, vol. 117, no. 2, Feb. 2013, p. 46, https://oajournals.fupress.net/index.php/ijae/article/view/4232.