Contribution to authorship
LP, EDG, AK and AC conceived the study concept and design. LP and AK
collected and controlled the data. AC completed the analysis, including
quality assurance and control, with the assistance of LP and AK. LP
wrote the manuscript under the supervision of EDG. All authors aided in
the design of the study, in the interpretation of the data and critical
revision of the manuscript for valuable intellectual content, and all
authors approved the final version.