Author Contributions: Dr Ferlin had full access to all of the data in the study and takes responsibility for the integrity of the data and the accuracy of the data analysis.
Study concept and design: Ferlin, B. Zuccarello, Foresta.
Acquisition of data: Ferlin, D. Zuccarello, B. Zuccarello, Chirico.
Analysis and interpretation of data: Ferlin, D. Zuccarello, Zanon, Foresta.
Drafting of the manuscript: Ferlin, D. Zuccarello, Foresta.
Critical revision of the manuscript for important intellectual content: B. Zuccarello, Chirico, Zanon, Foresta.
Statistical analysis: Ferlin.
Obtained funding: Foresta.
Administrative, technical, or material support: D. Zuccarello, B. Zuccarello, Chirico.
Study supervision: Ferlin, B. Zuccarello, Zanon, Foresta.
Financial Disclosures: None reported.
Funding/Support: This study was supported by grant 2005062572 from the Italian Ministry of University to Drs Ferlin, Daniela Zuccarello, and Foresta.
Role of the Sponsor: The sponsor had no role in the design and conduct of the study; collection, management, analysis, and interpretation of the data; or preparation, review, or approval of the manuscript.
Additional Contributions: We thank Elena Speltra, BSc, and Cristina Patassini, BSc, biologists from the Department of Histology, Microbiology, and Medical Biotechnologies, University of Padova, for technical assistance, and Annachiara Frigo, MD, statistician from the Department of Environmental Medicine and Public Health, University of Padova, for assistance with statistical analysis. None received compensation for this work.