The presence of the fever and anti-DNS antibodies correlated with SLE (P = 0.0104, Fisher exact test), arthritis/arthralgia and anti-RNP antibodies with MCTD (P = 0.0302), Raynaud phenomenon and ANA positivity with PSS (P = 0.0144), xerostomia/xerophtalmia and anti-SSA/SSB antibodies with Sj?gren syndromes (P = 0.0144). 