1. C. Bordignon, N. Nobili, G. Ferrari, D. Maggioni, C. Rossi, P. Servida, F. Mavilio, Telethon Gene Therapy Program for Genetic Diseases, DIBIT, Istituto Scientifico H. S. Raffaele, Milan, Italy.
2. L. D. Notarangelo, E. Mazzolari, A. G. Ugazio, Department of Pediatrics, University of Brescia Medical School, Brescia, Italy.
3. G. Casorati, Unità di Immunochimica, DIBIT, Istituto Scientifico H. S. Raffaele, Milan, Italy.
4. P. Panina, Roche Milano Ricerche, Milan, Italy.