The effect of high altitude (2500 m) on incremental cycling exercise in patients with pulmonary arterial hypertension and chronic thromboembolic pulmonary hypertension: a randomised controlled crossover trial.

"Conflict of interest: None of the authors have any conflicts of interest in relation to this manuscript."

"Support statement: The trial is publicly funded by the Swiss National Science Foundation (SNSF, grant number 32003B_197706). Funding information for this article has been deposited with the Crossref Funder Registry."

"All patients gave written informed consent for participation and further use of their data for scientific analysis. The study complies with the Declaration of Helsinki and was approved by the local ethical authorities as part of an umbrella study. The study was registered on ClinicalTrials.gov (NCT05107700). This study is registered at ClinicalTrials.gov with identifier number NCT05107700. Individual participant data reported in this randomised controlled trial will be available after de-identification by contacting the corresponding author."