Silvio De Flora, Alberto Izzotti, Francesco D'Agostini, Giovanni A. Rossi, Roumen M. Balansky, Pulmonary Alveolar Macrophages in Molecular Epidemiology and Chemoprevention of Cancer, Environmental Health Perspectives, Vol. 99 (Mar., 1993), pp. 249-252
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Flora et al. (1993) studied this question.
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