1 Department of Applied Research and Technical Development, Istituto Nazionale dei Tumori, Milan, Italy. Electronic address: vera.cappelletti@istitutotumori.mi.it.
2 Department of Applied Research and Technical Development, Istituto Nazionale dei Tumori, Milan, Italy.
3 Head and Neck Medical Oncology Unit, Fondazione IRCCS, Istituto Nazionale dei Tumori, Milan, Italy.
4 Head and Neck Medical Oncology Unit, Fondazione IRCCS, Istituto Nazionale dei Tumori, Milan, Italy; University of Milan, Milan, Italy.
5 Head and Neck Medical Oncology Unit, Fondazione IRCCS, Istituto Nazionale dei Tumori, Milan, Italy. Electronic address: laura.locati@istitutotumori.mi.it.