The Clinical Significance of Specific Antibody Deficiency (SAD) Severity in Chronic Rhinosinusitis (CRS) Despite the increased identification of specific antibody deficiency (SAD) in chronic… sciencedirect.com The clinical syndrome of specific antibody deficiency in children ncbi.nlm.nih.gov Characterization of specific antibody deficiency in adults with medically refractory chronic rhinosinusitis ncbi.nlm.nih.gov Specific Antibody Deficiency: Controversies in Diagnosis and Management frontiersn.org