882P Quitting smoking after diagnosis of head and neck cancer is associated with reduced risk of mortality: A multicentric prospective cohort study von Sheikh, M., Nemati, S., Dudding, T., Vilensky, M., Figari, M., Arantes, L.M.R.B., Rodriguez, P., Curado, M.P., Kowalski, L.P., de Oliveira, J.C., Waterboer, T., Ribeiro Pinto, L.F., Dias, F.L., Soares Lima, S.C., Cuello, M., Zeidler, S., Pring, M., de Carvalho Peters, A.C., Perdomo, S.P., Virani, S.

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