Nguyễn , T.H. et al. 2026. A PRELIMINARY SURVEY OF BARRIERS FACED BY CARDIOLOGISTS IN THE DIAGNOSIS AND MANAGEMENT OF HEART FAILURE WITH PRESERVED EJECTION FRACTION IN OLDER ADULTS. Vietnam Medical Journal. 561, 1 (Jun. 2026). DOI:https://doi.org/10.51298/vmj.v561i1.18125.