Voll-Aanerud M, Eagan TM, Plana E, Omenaas ER, Bakke PS, Svanes C. Respiratory symptoms in adults are related to impaired quality of life, regardless of asthma and COPD: results from the European community respiratory health survey. Health Qual Life Outcomes. 2010 Sep;8:107.
Arbuckle R, Atkinson MJ, Clark M, Abetz L, Lohs J, Kuhagen I, Harness J, Draelos Z, Thiboutot D, Blume-Peytavi U, Copley-Merriman K. Patient experiences with oily skin: the qualitative development of content for two new patient reported outcome questionnaires. Health Qual Life Outcomes. 2008 Oct 16;6:80. doi: 10.1186/1477-7525-6-80.