Author contributions
Concept and design: FM and AP; development of methodology: FM, IT; acquisition of data: FM, SC, MP, LB, CR, EP, CR, ST, MC, FF, AM; data analysis and interpretation: FM, IT, AM, AP; technical and statistical support: IT, EP; manuscript writing: FM and GR; critical review of the manuscript: FF, AM, AP.
Disclosure statement
The authors report no conflict of interests.