1. Department of Dermatology, University Medical Center Utrecht, Utrecht, The Netherlands;
2. Department of Clinical Chemistry, Erasmus University Medical Center Rotterdam, Rotterdam, The Netherlands;
3. Laboratory for Clinical Chemistry and Hematology (LKCH), University Medical Center Utrecht, Utrecht, The Netherlands;
4. Department of Clinical Pharmacy, University Medical Center Utrecht, Utrecht, The Netherlands;
5. Department of Clinical Pharmacy, St Antonius Hospital, Nieuwegein, The Netherlands