Kliem, S., Lohmann, A., Klatt, T., Mößle, T., Rehbein, F., Hinz, A., Beutel, M., & Brähler, M. (2017). Brief assessment of subjective health complaints: Development, validation and population norms of a brief form of the Giessen Subjective Complaints List (GBB-8). Journal of Psychosomatic Research, 95, 33-43.