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Frei, Marc; Engel Brügger, Odette; Sendi, Pedram; Reichart, Peter A; Ramseier, Christoph A; Bornstein, Michael M (2012). Assessment of smoking behaviour in the dental setting. A study comparing self-reported questionnaire data and exhaled carbon monoxide levels. Clinical oral investigations, 16(3), pp. 755-60. Berlin: Springer-Verlag 10.1007/s00784-011-0583-2
