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Contributors BZ and CC conceived the idea for the study. CC, CF and SV were involved in study design and data collection. CC and BZ were responsible for data analysis and manuscript preparation in consultation with all authors. All authors had access to study data, take responsibility for the accuracy of the analysis, had authority over manuscript preparation and have read and approved the final version of the 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.
Patient consent for publication Not required.
Provenance and peer review Not commissioned; internally peer reviewed.
Data availability statement The datasets used and analysed during the current study are available from the corresponding author on reasonable request.
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