1 Department of Surgical and Medical Sciences (SMECHIMAI), University of Modena and Reggio Emilia, and Respiratory Unit, University Hospital of Modena Policlinico, Modena, I.
2 Division of Population Medicine, Cardiff University, Wales, UK.
3 Department of Biostatistics and Health Informatics, Institute of Psychiatry, Psychology and Neuroscience, King's College London, England, UK.
4 Clinical and Experimental Medicine PhD School, University of Modena and Reggio, Modena, I.
5 Department of Surgical and Medical Sciences (SMECHIMAI), University of Modena and Reggio Emilia, and Respiratory Unit, University Hospital of Modena Policlinico, Modena, I. Electronic address: enrico.clini@unimore.it.