MEFV and familial Mediterranean fever: Based on genotypes of the patients; study cohort were divided into 3 groups: Patients homozygous for M694V (Group 1), patients carrying other pathogenic MEFV variants (M694I, M680I, V726A) in exon 10 either in a homozygous or compound heterozygous state (Group 2) and FMF patients with other variants (homozygous, heterozygous or compound heterozygous) or without any mutation (Group 3).