Published on in Vol 9, No 5 (2021): May
                                    Preprints (earlier versions) of this paper are
                                    available at
                                    https://preprints.jmir.org/preprint/21455, first published
                                    .
                                

1 Department of Orthopaedics, Tongde Hospital of Zhejiang Province, Hangzhou, China
2 Federal Institute for Drugs and Medical Devices, Medical Devices Division, Bonn, Germany
