- Correspondence to Dr Anna Myriam Perrone, Azienda Ospedaliero-Universitaria di Bologna Policlinico SantOrsola-Malpighi, Bologna 40123, Italy;
- Received April 14, 2020
- Revision received May 11, 2020
- Accepted May 13, 2020
- First published May 30, 2020.
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