Metal elements as early biomarkers of lung cancer - Urizar Catalan, Byron Enrique; Padron Fraysse, Luis; Callejon-Leblic, Belen; Garcia Garrido, Sandra; Ignacio Barrios, Victoria; Gomez Ariza, Jose Luis; Moron Ortiz, Maria; Garcia-Barrera, Tamara; Pereira Vega, Antonio (EUROPEAN RESPIRATORY JOURNAL, 2019)