The publication in which the measure was originally published.
Duncan P, Murphy M, Man M-S, et al. Development and validation of the Multimorbidity Treatment Burden Questionnaire (MTBQ). BMJ Open 2018;8:e019413. doi:10.1136/ bmjopen-2017-019413
Karina Friis, Mathias Lasgaard, Marie Hauge Pedersen, Polly Duncan, Helle Terkildsen Maindal. 2019. Health literacy, multimorbidity, and patient-perceived treatment burden in individuals with cardiovascular disease. A Danish population-based study, Patient Education and Counseling, 102 (10), 1932-1938, https://doi.org/10.1016/j.pec.2019.05.013.