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Contributors All authors contributed to the study conception and design. Material preparation and data analyses were performed by IR, but all authors contributed to data interpretation. The first draft of the manuscript was written by IR and all authors commented on previous versions of the manuscript. Language revision was performed by Jacquelin De Faveri. All authors and contributors read and approved the final manuscript.
Funding IR received personal research grants from Maire Taponen, Paulo and Aarne Koskelo foundations (no specific grant numbers available).
Competing interests None declared.
Provenance and peer review Not commissioned; externally peer reviewed.
Supplemental material This content has been supplied by the author(s). It has not been vetted by BMJ Publishing Group Limited (BMJ) and may not have been peer-reviewed. Any opinions or recommendations discussed are solely those of the author(s) and are not endorsed by BMJ. BMJ disclaims all liability and responsibility arising from any reliance placed on the content. Where the content includes any translated material, BMJ does not warrant the accuracy and reliability of the translations (including but not limited to local regulations, clinical guidelines, terminology, drug names and drug dosages), and is not responsible for any error and/or omissions arising from translation and adaptation or otherwise.