1. Dept. of Internal Medicine, Medical University of Silesia, Sosnowiec, Poland; Dept. of Molecular Biology, Biochemistry and Biopharmacy, Medical University of Silesia, Sosnowiec, Poland; Dept. of Immunology, Rydygier's Medical School, Bydgoszcz, Poland; and Dept. of Immunology, Children's Memorial Hospital, Warsaw, Poland