1 Division of Pharmacology, The Netherlands Cancer Institute, Amsterdam, Netherlands; Department of Clinical Chemistry and Laboratory Medicine, Leiden University Medical Center, Leiden, Netherlands.
2 Department of Medical Oncology, Leiden University Medical Center, Leiden, Netherlands.
3 Department of Gastrointestinal Oncology, Division of Medical Oncology, The Netherlands Cancer Institute, Amsterdam, Netherlands.
4 Department of Medical Oncology, Erasmus MC Cancer Institute, Erasmus University Medical Center, Rotterdam, Netherlands.
5 Department of Clinical Pharmacy and Toxicology, Leiden University Medical Center, Leiden, Netherlands.
6 Division of Pharmacology, The Netherlands Cancer Institute, Amsterdam, Netherlands; Department of Pharmaceutical Sciences, Faculty of Science, Utrecht University, 3584 CG Utrecht, Netherlands. Electronic address: j.schellens@gmail.com.