1. Institute of Gastrointestinal Oncology, Military University Hospital Prague, 169 02 Prague, Czech Republic
2. Department of Medicine, First Faculty of Medicine, Charles University, Prague and Military University Hospital Prague, 169 02 Prague, Czech Republic
3. Biomedical Research Centre, University Hospital Hradec Kralove, 500 03 Hradec Kralove, Czech Republic
4. The Royal Marsden NHS Foundation Trust, London SW3 6JJ, UK
5. Third Department of Internal Medicine—Endocrinology and Metabolism, First Faculty of Medicine, Charles University, Prague and General University Hospital in Prague, 128 08 Prague, Czech Republic
6. Institute of Health Information and Statistics of the Czech Republic, 128 01 Prague, Czech Republic
7. Institute of Biostatistics and Analyses, Faculty of Medicine, Masaryk University, 602 00 Brno, Czech Republic
8. Department of Medicine, Third Faculty of Medicine, Charles University, Prague and University Hospital Kralovske Vinohrady, 100 00 Prague, Czech Republic