TGL : Total serum Gammaglobulin Level; L-TGL : Lowest-TGL; H-TGL : Highest-TGL; IgG (or A, or M) : serum dosage of Immunoglobulin G (or A or M); CRP : serum C-Reactive Protein; AG-Ratio : Ratio of serum Albumin level on Total serum Gammaglobulin level