1. Department of Infectious, Parasitic & Immuno-Mediated Diseases; Istituto Superiore Di Sanità; Rome Italy
2. Structural Biology Research Center, Photon Factory; Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK); Tsukuba Ibaraki Japan
3. Department of Integrative Physiology and Pathobiology; Tufts University School of Medicine; Boston MA USA