Clinical characteristics and mortality predictors among very old patients with pulmonary thromboembolism: a multicenter study report.

"Declarations Ethics approval and consent to participateThe studies involving human participants were reviewed and approved by the Ethics Committee in China-Japan Friendship Hospital. Informed consent was obtained from all patients. The participants provided their written informed consent to participate in this study. Consent for publicationsNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding The study was funded by the China Key Research Projects of the 12th National Five-Year Development Plan (number 2011BA11B17), the CAMS Innovation Fund for Medical Sciences (CIFMS) (number 2018-I2M-1–003), the National Key R&D Program of China (number 2016YFC0905600, 2016YFC0901104), the National Key Research and Development Program (2023YFC2507200), the National Nature Science Foundation of China (81900047, 62206187), Beijing Research Ward Demonstration Construction Project (No. BCRW202110), and the Financial Budgeting Project of Beijing Institute of Respiratory Medicine (Ysbz2023003)."