CD79A and acquired polycythemia vera: PF: Pemphigus foliaceus; PV: Pemphigus vulgaris; IgA: Immunoglobulin A; BP: Bullous pemphigoid; CBDC: Chronic bullous disease of childhood; EBA: Epidermolysis bullosa acquisita; DH: Dermatitis herpetiformis; LPP: Lichen planus pemphigoid; LIGA: Linear IgA disease