1. Department of Epidemiology, the Netherlands Cancer Institute, Amsterdam;
2. Utrecht Institute for Pharmaceutical Sciences (UIPS), Division of Pharmacoepidemiology and Pharmacotherapy, Utrecht;
3. Department of Bioinformatics and Statistics, the Netherlands Cancer Institute, Amsterdam;
4. Department of Hematology, Erasmus Medical Center (MC), Daniel den Hoed Cancer Center, Rotterdam; and
5. Department of Radiotherapy, the Netherlands Cancer Institute, Amsterdam, the Netherlands