1 Serra Húnter Programme, Department of Pathology and Experimental Therapeutics, Faculty of Medicine and Health Sciences, University of Barcelona (UB), Hospitalet del Llobregat, 08097, Catalonia, Spain.
2 Departament de Genètica, Microbiologia i Estadística, Facultat de Biologia and Institut de Biomedicina (IBUB), Universitat de Barcelona (UB), Barcelona, 08028, Catalonia, Spain. Electronic address: mcorominas@ub.edu.