- Correspondence to Dr Erlin A Haacke, Department of Rheumatology & Clinical Immunology, University Medical Center Groningen, Hanzeplein 1 (AA21), 9713 GZ, Groningen, The Netherlands;
- Received 10 February 2017
- Revised 1 June 2017
- Accepted 10 June 2017
- Published online 14 July 2017.
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