Hifinger M, Hiligsmann M, Ramiro S, Watson V, Berghea F, Pentek M, Keat A, Severens JL, Fautrel B, Boonen A. Influence of disease activity on RA treatment choices in countries with restricted access to expensive, innovative drugs: a discrete choice experiment among rheumatologists. RMD open. 2017 Sep 4;3(2):E000453. doi: 10.1136/rmdopen-2017-000453
Derby CA, Araujo AB, Johannes CB, Feldman HA, McKinlay JB. Measurement of erectile dysfunction in population-based studies: the use of a single question self-assessment in the Massachusetts Male Aging Study. Int J Impot Res. 2000 Aug 1;12(4):197-204.