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B. Corresponding and . Bennani, PhD Laboratoire de Biologie des cancers Equipe des microorganismes et facteurs oncogènes Faculté de Médecine et de pharmacie de Fès BP. 1893; Km 2.200 Route Sidi Harazem-Fès Maroc Telephone: +212661730763; Fax: +212535619321 Email: bahia_bc@yahoo.fr Conflict of interests: No conflict of interests is declared