- Correspondence to Dr Andrea Tognù, Istituto Ortopedico Rizzoli Istituto di Ricovero e Cura a Carattere Scientifico, Bologna 40136, Italy;
- Received April 24, 2020
- Revision received April 30, 2020
- Accepted April 30, 2020
- First published May 13, 2020.
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