- Correspondence to Dr Lorenzo Beretta, Referral Center for Systemic Autoimmune Diseases, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico di Milano, Milan 20122, Italy;
- Received February 10, 2020
- Revised April 30, 2020
- Accepted May 14, 2020
- First published June 19, 2020.
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