Immunoexpression of PD-L1, CD4+ and CD8+ cell infiltrates and tumor-infiltrating lymphocytes (TILs) in the microenvironment of actinic cheilitis and lower lip squamous cell carcinoma. J Appl Oral Sci [Internet]. 2022 Feb. 23 [cited 2024 Jun. 3];30:e20210344. Available from: https://www.periodicos.usp.br/jaos/article/view/195220