Diagnosis and treatment of snoring in adults-S2k guideline of the German Society of Otorhinolaryngology, Head and Neck Surgery - Stuck, Boris; Dreher, Alfred; Heiser, Clemens; Herzog, Michael; Kühnel, Thomas; Maurer, Joachim T.; Pistner, Hans; Sitter, Helmut; Steffen, Armin; Verse, Thomas (Sleep and breathing, 2015)