Affiliation: | 1. Department of Plastic Surgery, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, U.S.A.;2. Department of Head and Neck Surgery, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, U.S.A.;3. Department of Epidemiology, The University of Texas M. D. Anderson Cancer Center, Houston, Texas, U.S.A. |