No T1-2, N1 disease in which node positivity is based on the presence of retropharyngeal lymph nodes [clinicaltrials_resource:309f7ad031dec7e31b37811b0a01727c]

No T1-2, N1 disease in which node positivity is based on the presence of retropharyngeal lymph nodes [clinicaltrials_resource:309f7ad031dec7e31b37811b0a01727c]