Acknowledgements
The authors thank Kevin Smart for language support in writing this manuscript. F Atzeni drafted the manuscript; P Sarzi-Puttini and M Benucci participated in the study. All of the authors have read and approved the final manuscript.
Financial & competing interests disclosure
The authors have no relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript. This includes employment, consultancies, honoraria, stock ownership or options, expert testimony, grants or patents received or pending, or royalties.
No writing assistance was utilized in the production of this manuscript.