Effect of moderate altitude and nocturnal oxygen therapy on cerebrovascular function in patients with COPD: A randomized, crossover trial at 2048 m. - Gilliand D; Latshang TD; Aeschbacher SS; Huber F; Flueck D; Lichtblau M; Ulrich S; Hasler ED; Scheiwiller PM; Müller J; Bloch KE; Furian M (Experimental physiology, 2026)