^aLaboratory of Clinical Biochemistry and Molecular Biology, University of Pisa

^bDepartment of Laboratory Medicine and Molecular Diagnostics, Pisa University Hospital, Pisa, Italy

Correspondence to Pietro Pietrini, MD, PhD, Director, Department of Laboratory Medicine and Molecular Diagnostics, University of Pisa Medical School, Azienda Ospedaliero Universitaria Pisana ‘Santa Chiara’, Building 43, via Roma, 67 I-56127 Pisa, Italy Tel: +39 050 993951; fax: +39 050 992806; e-mail: [email protected]