title: Reply.
authors.affiliation: Interdepartmental Center for Systemic Manifestations of Hepatitis Viruses (MaSVE) Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.
authors.forename: Anna Linda
authors.initials: AL
authors.lastname: Zignego
authors.affiliation: Interdepartmental Center for Systemic Manifestations of Hepatitis Viruses (MaSVE) Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy.
authors.forename: Laura
authors.initials: L
authors.lastname: Gragnani
authors.affiliation: Department of Clinical Medicine, Sapienza University of Rome, Regional Referral Center for Mixed Cryoglobulinemia, Policlinico Umberto I, Rome, Italy.
authors.forename: Marcella
authors.initials: M
authors.lastname: Visentini
authors.affiliation: Department of Clinical Medicine, Sapienza University of Rome, Regional Referral Center for Mixed Cryoglobulinemia, Policlinico Umberto I, Rome, Italy.
authors.forename: Milvia
authors.initials: M
authors.lastname: Casato