SMG6 and rheumatoid arthritis: Influence of TCF21, LPA, HHIPL1, RASD1-PEMT, MRPS6, CYP17A1-CNNM2-NT5C2, SMG6-SRR, PHACTR1, WDR12 and COL4A1-COL4A2 polymorphisms on CV events or subclinical atherosclerosis in patients with RA