Fractional exhaled nitric oxide-a possible biomarker for risk of obstructive sleep apnea in snorers. - Kiaer E; Ravn A; Jennum P; Prætorius C; Welinder R; Ørntoft S; von Buchwald C; Backer V (Journal of clinical sleep medicine : JCSM : official publication of the American Academy of Sleep Medicine, 2024)