1. Department of Clinical Pharmacy, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
2. Nijmegen University Centre for Infectious Diseases, Nijmegen, The Netherlands
3. Department of Hospital Pharmacy, The Hague Central Hospital Pharmacy, The Hague, The Netherlands
4. Association for Quality Assessment in Therapeutic Drug Monitoring and Clinical Toxicology (KKGT), The Hague, The Netherlands
5. Department of Medical Microbiology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands