References- Best Pract Res Clin Rheumatol. 2009 Apr;23(2):161-92. [PMID:19393565]
- J Emerg Med. 2006 Apr;30(3):331-9. [PMID:16677989]
- Ann Rheum Dis. 2002 Jun;61(6):493-8. [PMID:12006320]
- Best Pract Res Clin Rheumatol. 2005 Jun;19(3):371-86. [PMID:15939364]
- Alan Wu. Tietz Clinical Guide to Laboratory Tests, Fourth Edition. Saunders; 4 edition (June 13, 2006). ISBN-10: 0721679757