1. The Maria Sklodowska-Curie National Research Institute of Oncology and Medical Center for Postgraduate Education, Warsaw, Poland (N.D.P., M.B., P.W., M.R., J.R.)
2. The Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland (R.F., M.P.)
3. National Cancer Registry of Poland, The Maria Sklodowska-Curie National Research Institute of Oncology, Warsaw, Poland (J.D., U.W.)
4. The Maria Sklodowska-Curie National Research Institute of Oncology and Medical Center for Postgraduate Education, Warsaw, Poland, and Institute of Health and Society, University of Oslo, Oslo, Norway (M.F.K.)