TNFRSF13B and systemic lupus erythematosus: Concerning the analysis of rare variants at the gene level, TNFRSF13B was associated with SLE using SKAT with all the three filters applied: including all the variants with MAF < 0.05 (p = 0.03), restricting the analysis to those rare variants missense or frameshift (p = 0.006) and including only rare variants VUS, LP and P (p = 0.01).