About the Authors

Paolo Valera

Contributed equally to this work with: Paolo Valera, Patrizia Zavattari

pvalera@unica.it (PV); pzavattari@unica.it (PZ)

Affiliation Department of Civil-Environmental Engineering and Architecture, University of Cagliari, Cagliari, Italy

Patrizia Zavattari

Contributed equally to this work with: Paolo Valera, Patrizia Zavattari

pvalera@unica.it (PV); pzavattari@unica.it (PZ)

Affiliation Department of Biomedical Sciences, University of Cagliari, Cagliari, Italy

Alessandro Sanna

Affiliation Department of Civil-Environmental Engineering and Architecture, University of Cagliari, Cagliari, Italy

Salvatore Pretti

Affiliation Department of Civil-Environmental Engineering and Architecture, University of Cagliari, Cagliari, Italy

Alberto Marcello

Affiliation Department of Civil-Environmental Engineering and Architecture, University of Cagliari, Cagliari, Italy

Carla Mannu

Affiliation Centre for the Study of Diabetes Complications and Metabolic Diseases, St. Michele Hospital, Cagliari, Italy

Clara Targhetta

Affiliation Centre for the Study of Diabetes Complications and Metabolic Diseases, St. Michele Hospital, Cagliari, Italy

Graziella Bruno

Affiliation Department of Medical Sciences, University of Turin, Turin, Italy

Marco Songini

Affiliation Centre for the Study of Diabetes Complications and Metabolic Diseases, St. Michele Hospital, Cagliari, Italy

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Analyzed the data: PV PZ AS. Contributed reagents/materials/analysis tools: PV SP AM. Wrote the paper: PV PZ GB SP CM CT MS. Geochemical samples collection: PV SP AM. Set of geochemical archive: PV. Design and supervision of the study: PV PZ GB MS. Creation of figures and tables: PV AS. Interpretation of biological rational: PZ. Type 1 diabetes incidence data collection: CM CT.