Inclusion of extranodal extension in the lymph node classification of cutaneous squamous cell carcinoma of the head and neck. - Amit M; Liu C; Gleber-Netto FO; Kini S; Tam S; Benov A; Aashiq M; El-Naggar AK; Moreno AC; Rosenthal DI; Glisson BS; Ferrarotto R; et al. (Cancer, 2021)