Clinical and economic benefit of upper airway stimulation for obstructive sleep apnea in the German setting - Weschenfelder, AK; Pietzsch, JB; Randerath, W; Steffen, A; Liu, S; Geisler, B; Wasem, J; Biermann-Stallwitz, J (Laryngo-Rhino-Otologie, 2018)