[Link to published trial protocol]: Kastaun S, Leve V, Hildebrandt J, et al. Effectiveness of training general practitioners to improve the implementation of brief stop-smoking advice in German primary care: study protocol of a pragmatic, 2-arm cluster randomised controlled trial (the ABCII trial). BMC family practice. 2019;20(1):107.
[Link to German Clinical Trials Register:] DRKS00012786.