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Contributors KM and TM collected the data, EN analysed the data and critically reviewed the manuscript, and RL critically reviewed the manuscript and coordinated the research activities. All authors took part in writing the manuscript and approved the final version.
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.
Ethics approval The ethics committee of the University of Zagreb School of Medicine approved the protocol of the study.
Provenance and peer review Not commissioned; externally peer reviewed.
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