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Submitted on: 28 October 2014.
Revised on: 13 January 2015.
Accepted on: 20 February 2015.
___________________Advances in Rheumatology---BMC
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Submitted on: 20 June 2009.
Revised on: 31 August 2009.
Accepted on: 05 October 2009.
___________________Advances in Rheumatology---BMC