MVK and X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection and neoplasia: In addition, one patient was diagnosed with X-linked immunodeficiency with magnesium defect, Epstein-Barr virus infection and neoplasia (XMEN) due to a hemizygous MAGT1 variant and another newborn with autoinflammatory syndrome caused by MVK variants.