Assessment of exposure to secondhand smoke by questionnaire and salivary cotinine in the general population of Barcelona, Spain (2004-2005).
Martínez-Sánchez JM, Fernández E, Fu M, Pascual JA, Ariza C, Agudo A, Borràs JM, Schiaffino A, Moncada A, Jané M, Saltó E, Nebot M, Samet JM; DCOT study investigators.
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