El-Sayed, Zeinab A X-linked agammaglobulinemia (XLA):Phenotype, diagnosis, and therapeutic challenges around the world. [electronic resource] - The World Allergy Organization journal 2019 - 100018 p. digital Publication Type: Journal Article ISSN: 1939-4551 Standard No.: 10.1016/j.waojou.2019.100018 doi