Response to Letter Regarding Article, "Heart Failure, Saxagliptin and Diabetes Mellitus. Issue 6 (11th August 2015) - Scirica, Benjamin M.; Braunwald, Eugene; Raz, Itamar; Cavender, Matthew A.; Morrow, David A.; Jarolim, Petr; Udell, Jacob A.; Mosenzon, Ofri; Im, KyungAh; Umez-Eronini, Amarachi A.; Pollack, Pia S.; Hirshberg, Boaz; et al.