Obstructive Sleep Apnea and Hypopnea Efficacy and Safety of a Long-Acting β2-Agonist - Rasche, Kurt; Duchna, Hans-Werner; Lauer, Julia; Orth, Maritta; Kotterba, Sylvia; Bauer, Torsten Thomas; Gillissen, Adrian; Schultze-Werninghaus, Gerhard (Sleep and Breathing, 1999)