Prognostic factors determining long-term survival in well-differentiated thyroid cancer: an analysis of four hundred eighty-four patients undergoing therapy and aftercare at the same institution - Eichhorn, W; Tabler, H; Lippold, R; Lochmann, M; Schreckenberger, M; Bartenstein, P (Thyroid : official journal of the American Thyroid Association, 2003)