Head-of-bed elevation outcomes on apnea severity nasal resistance in obstructive sleep apnea: a multicenter observational study. - Maniaci A; Lentini M; Lechien JR; Iannella G; Casale M; Moffa A; Pelucchi S; Caranti A; Pang KP; Rotenberg B; Vicini C (Sleep & breathing = Schlaf & Atmung, 2025)