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Ramseier, Christoph Andreas; Mirra, Damiano; Schütz, Christian; Sculean, Anton; Lang, Niklaus Peter; Walter, Clemens; Salvi, Giovanni Edoardo (2015). Bleeding on probing as it relates to smoking status in patients enrolled in supportive periodontal therapy for at least 5 years. Journal of clinical periodontology, 42(2), pp. 150-159. Wiley 10.1111/jcpe.12344
