N1 esophageal carcinoma: the importance of staging and downstaging - Rice,T.W.; Blackstone,E.H.; Adelstein,D.J.; Zuccaro,G.; Vargo,J.J.; Goldblum,J.R.; Rybicki,L.A.; Murthy,S.C.; Decamp,M.M. (J Thorac Cardiovasc Surg, 2001)