Up-Titration of Sacubitril/Valsartan Among Patients With Heart Failure and Preserved Ejection Fraction oleh Koichiro Matsumura MD, Takeshi Ijichi MD, Junko Morimoto MD, Kensuke Takabayashi MD, Mitsunori Miho MD, Keisuke Ueno MD, Eijiro Yagi MD, Toru Takase MD, Masafumi Ueno MD, Gaku Nakazawa MD