- 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, 8 Penn Tower, 1 Convention Ave, Philadelphia, PA 19104, USA;
- Received April 3, 2014
- Revised September 15, 2014
- Accepted October 5, 2014
- First published October 28, 2014.
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