Received: 6 December 2020
Accepted: 6 June 2021
First Online: 22 June 2021
: The Institutional Review Board of Campus Bio-Medico University of Rome ruled that no formal ethics approval was required in this particular case. The access to the database is on request. All data were obtained by the Direzione Generale della Programmazione Sanitaria—Banca Dati SDO of the Italian Ministry of Health.
: Not applicable.
: UGL is a member of the Editorial Board of BMC Musculoskeletal Disorders. The remaining authors declare that they have no conflict of interest.