Anti-PD-1 Induced Musculoskeletal Side Effects Successfully Treated With Hydroxychloroquine in Patients With Advanced Cutaneous Squamous Cell Carcinoma - I. Villegas-Romero; J.F. Millán-Cayetano; D. Jiménez-Gallo; T. Fernández-Morano; I. Navarro-Navarro; M. Linares-Barrios (Actas Dermo-Sifiliográficas)