Cancer detection and prevention : proceedings of the 2nd International symposium on cancer detection and prevention, Bologna, April 9-12, 1973 / ed. board: Cesare Maltoni (president), Yves Fassin ... [et al.] ; linguistic ed.: M.S. Chesters ... [et al.]De Rijksuniversiteit Gent en de regio / [bijdr. van P. Coetsier ... et al. ; hoofdred. Caroline de Clercq, Yves Fassin]