CD79A and hyperinsulinemic hypoglycemia, familial, 4: The sample sizes of patients with SIgAD, PIgAD, and IgAD patients with IgG subclass deficiency in included articles varied from 4 patients with IgA deficient patients with IgG subclass deficiency of the Affiliated University Children’s Hospital in Berne up to 2100 SIgAD patients in a study through six university hospitals in Sweden.