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http://www.medweb.gr/2016/11/23/%ce%b2%ce%b9%ce%bf%ce%bb%ce%bf%ce%b3%ce%b9%ce%ba%ce%bf%ce%af-%cf%80%ce%b1%cf%81%ce%ac%ce%b3%ce%bf%ce%bd%cf%84%ce%b5%cf%82-%cf%80%cf%81%ce%bf%ce%ba%ce%b1%ce%bb%ce%bf%cf%8d%ce%bd-%ce%bb%ce%bf%ce%b9/
Βιολογικοί παράγοντες: προκαλούν λοιμώξεις και νεοπλάσματα;