Bjornsdottir E, Janson C, Lindberg E, Arnardottir ES, Benediktsdottir B, Garcia-Aymerich J, Carsin AE, Real FG, Toren K, Heinrich J, Nowak D, Sanchez-Ramos JL, Demoly P, Arenas SD, Navarro RC, Schlunssen V, Raherison C, Jarvis DL, Gislason T. Respiratory symptoms are more common among short sleepers independent of obesity. BMJ Open Respir Res. 2017 Aug 30;4(1):e000206. doi: 10.1136/bmjresp-2017-000206
Lovas K, Geher P, Whalley D, McKenna S, Meads D, Kalo Z. Hungarian adaptation of a disease-specific quality-of-life questionnaire in patients with ankylosing spondylitis. Orv Hetil. 2002 Aug 11;43(32):1893-7.