Response to the manuscript "ex vivo donor heart preservation in heart transplantation (HTx)—Is this the solution to increase the donor pool?". Issue 12 (9th September 2021) - Pya, Yuriy; Medressova, Assel; Faizov, Linar; Kuanyshbek, Aidyn; Kaliyev, Rymbai; Myrzakhmetova, Gulzhan; Fleur, Philip la