- Correspondence to Dr Alexis Ogdie, Division of Rheumatology, Center for Clinical Epidemiology and Biostatistics, Center for Pharmacoepidemiology Research and Training, Perelman School of Medicine at the University of Pennsylvania, White Building, Room 5023, 3400 Spruce St., Philadelphia, PA 19104, USA;
- Received August 30, 2016
- Revised December 7, 2016
- Accepted December 28, 2016
- First published January 16, 2017.
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