Corrigendum: Time to clinical improvement: an appropriate surrogate endpoint for pulmonary arterial hypertension medication trials - Wang, An; Chen, Mengqi; Zhuang, Qi; Guan, Lihua; Xie, Weiping; Wang, Lan; Huang, Wei; Cheng, Zhaozhong; Yu, Shiyong; Zhou, Hongmei; Shen, Jieyan (Frontiers in Cardiovascular Medicine, 2024)