2013, Health related quality of life in adults in Germany: results of the German Health Interview and Examination Survey for Adults (DEGS1) 24. März 2020 Ellert U, Kurth BM. Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz. 2013 May;56(5-6):643-9 https://www.ncbi.nlm.nih.gov/pubmed/23703481
