- Correspondence to Dr Jeffrey R Curtis, Division of Clinical Immunology and Rheumatology, University of Alabama at Birmingham, 510 20th Street South, Faculty Office Towers 802D, Birmingham, AL 35294, USA;
- Received October 4, 2013
- Revised January 21, 2014
- Accepted February 16, 2014
- First published May 5, 2014.
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