Clinical outcome of nivolumab in older and frail patients with recurrent/metastatic head and neck squamous cell carcinoma. Issue 1 (January 2023) - Becherini, Carlotta; Banini, Marco; Desideri, Isacco; Salvestrini, Viola; Caprara, Luisa; Scotti, Vieri; Ganovelli, Michele; Morelli, Ilaria; Romei, Andrea; Livi, Lorenzo; Bonomo, Pierluigi