Neutrophil-lymphocyte ratio associated with poor prognosis in oral cancer: a retrospective study oleh Takumi Hasegawa, Tomoya Iga, Daisuke Takeda, Rika Amano, Izumi Saito, Yasumasa Kakei, Junya Kusumoto, Akira Kimoto, Akiko Sakakibara, Masaya Akashi