Article History
Received: 16 February 2018
Accepted: 7 August 2018
First Online: 31 August 2018
Competing interest
: UGL is a member of the Editorial Board of BMC Musculoskeletal Disorders. The remaining authors declare that they have no conflict of interest.
: The study was submitted and approved by the ethics committee of “Campus Bio Medico” of Rome. All patients gave written consent to participate in the study.
: Not applicable.
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