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Contributors FV takes responsibility for the manuscript as a whole. LP and CB conceived and designed the study. LP, FT and FT enrolled patients and collected and compiled data. DM performed the statistical analysis. LP, CB, FT, DM, FT and FV analysed and interpreted the data. LP and DM wrote the manuscript. FV commented and revised the report. All authors read and approved the final manuscript.
Funding The authors have not declared a specific grant for this research from any funding agency in the public, commercial or not-for-profit sectors.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.