tokens: Twenty-seven patients with tumors of the oral cavity , oropharynx , and maxillary sinus were examined , all of which were confirmed as squamous cell carcinomas .
folded_tokens: twenty-seven patients with tumors of the oral cavity , oropharynx , and maxillary sinus were examined , all of which were confirmed as squamous cell carcinomas .
labels: O B-multi_cell O B-tissue O O B-body_part I-body_part O B-body_part O O B-body_part I-body_part O O O O O O O O O B-tissue I-tissue I-tissue O