Age-related differences in hemodynamics and functional status in pulmonary arterial hypertension: Baseline results from the Pulmonary Hypertension Association Registry. - DesJardin JT; Kolaitis NA; Kime N; Kronmal RA; Benza RL; Elwing JM; Lammi MR; McConnell JW; Presberg KW; Sager JS; Shlobin OA; De Marco T (The Journal of heart and lung transplantation : the official publication of the International Society for Heart Transplantation, 2020)