A randomised controlled non-inferiority trial of primary care-based facilitated access to an alcohol reduction website (EFAR Spain): the study protocol von López-Pelayo, Hugo, Wallace, Paul, Segura, Lidia, Miquel, Laia, Díaz, Estela, Teixidó, Lidia, Baena, Begoña, Struzzo, Pierliugio, Palacio-Vieira, Jorge, Casajuana, Cristina, Colom, Joan, Gual, Antoni

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