1. Department of Medical Oncology; Erasmus MC Cancer Institute; 's-Gravendijkwal 230 3015CE Rotterdam
2. Department of Pharmaceutical Sciences; St Jude Children's Research Hospital; 262 Danny Thomas Place 38105-3678 Memphis TN USA
3. Department of Clinical Chemistry; Erasmus University Medical Center; 's-Gravendijkwal 230 3015CE Rotterdam the Netherlands
4. Department of Trials and Statistics; Erasmus University Medical Center; 's-Gravendijkwal 230 3015CE Rotterdam the Netherlands