IGHE and hereditary elliptocytosis: The children with a tolerance of HE had lower HE-specific IgE levels and higher HE-specific IgG4 levels than the children without tolerance of HE (IgE; with tolerance: 95.5 [46.5–231.9] vs. without tolerance: 258.3 [75.2–589.2], p−value: <0.001, IgG4; with tolerance: 1965.7 [970.9–3180.5] vs. without tolerance: 335.0 [115.5–1117.9], p−value: <0.001).