Photoaging smartphone app promoting poster campaign to reduce smoking prevalence in secondary schools: the Smokerface Randomized Trial: design and baseline characteristics by Michael Kreuter, Fabian N Fries, Titus J Brinker, Ute Mons, David A Groneberg, Anil Batra, Werner Seeger, Felix Herth, Julia Holzapfel, Tanja G Baudson, Katharina Sies, Lena Jakob, Hannah Maria Baumert, Marlene Heckl, Ana Cirac, Janina L Suhre, Verena Mathes, Hannah Spielmann, Nancy Rigotti, Tobias Raupach, Henning Gall, Claudia Bauer, Pat Marek, Chase H Harrison, Lava Taha, Andreas Owczarek, Felix J Hofmann, Roger Thomas

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