Flow Cytometric Analysis of Skin Blister Fluid Cells: A Promising Tool in the Differential Diagnosis of Acute Cutaneous Graft-versus-host Disease and Stevens–Johnson Syndrome/Toxic Epidermal Necrolysis - R. de Moraes Souza; T. Bellón; E. Fiz Benito; E. Sendagorta Cudós (Actas Dermo-Sifiliográficas)