1. Division of Infectious Diseases and Immunology, Department of Medical Sciences and Infectious Diseases Fondazione IRCCS Policlinico San Matteo Pavia Italy
2. Laboratory of Immunogenetics, Department of Transfusion Medicine and Immuno‐Hematology Fondazione IRCCS Policlinico San Matteo Pavia Italy
3. Department of Internal Medicine and Therapeutics University of Pavia Pavia Italy