T. Espejo, L. Kiakouama, R. Etter, and S. Condrau, “Sudden-onset platypnea-orthodeoxia syndrome in a patient with lung adenocarcinoma and COVID-19 without a patent foramen ovale”, EJCRIM, vol. 12, no. 11, Sep. 2025, doi: 10.12890/2025_005732.