The effect of an intensive smoking cessation intervention on disease activity in patients with rheumatoid arthritis: study protocol for a randomised controlled trial by Ida Kristiane Roelsgaard, Thordis Thomsen, Mikkel Østergaard, Robin Christensen, Merete Lund Hetland, Søren Jacobsen, Lena Andersen, Hanne Tønnesen, Silvia Rollefstad, Anne Grete Semb, Bente Appel Esbensen

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