Compliance with ethical standards: The Institutional Review Board and Health Director of San Giovanni di Dio Hospital in Florence reviewed and approved this study, and the use of everyday clinical and laboratory data for clinical and scientific studies and publications, in accordance with privacy laws. The aliquots of serum were taken off from the samples for routine diagnostic purposes as requested by the attending physicians.
Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Employment or leadership: None declared.
Honorarium: None declared.
Competing interests: The funding organization(s) played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
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