Effectiveness of the national German quitline for smoking cessation: study protocol of a randomized controlled trial.
Simone DelleLudwig KrausSimona MasperoOliver PogarellEva HochKirsten LochbühlerPublished in: BMC public health (2022)
The protocol for this study is registered with the German Clinical Trials Register: DRKS00025343, Date of registration: 2021/06/07, https://www.drks.de/drks_web/setLocale_EN.do.