- Correspondence to Dr Zachary S Wallace, Rheumatology Unit, Clinical Epidemiology Unit, Division of Rheumatology, Allergy, and Immunology, Massachusetts General Hospital Harvard Medical School, Boston, Massachusetts, USA;
- Received October 17, 2018
- Revised November 25, 2018
- Accepted December 10, 2018
- First published January 5, 2019.
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