Increased Prevalence of Immunoglobulin A Deficiency in Patients with the Chromosome 22q11.2 Deletion Syndrome (DiGeorge Syndrome/Velocardiofacial Syndrome)

↵* Corresponding author. Mailing address: Division of Immunologic and Infectious Diseases, The Children’s Hospital of Philadelphia, 34th St. and Civic Center Blvd., Philadelphia, PA 19104. Phone: (215) 590-4685. Fax: (215) 590-3044. E-mail:sullivak{at}mail.med.upenn.edu.