Trends and levels of the global, regional, and national burden of pulmonary arterial hypertension from 1990 to 2021: findings from the global burden of disease study 2021 - Liu, Le; Li, Chen; Cai, Jing; Kong, Renjing; Wang, Yanjiao; Wang, Yi; Li, Shuang; Zhan, Junkun; Liu, Youshuo (Frontiers in Medicine, 2024)