A design for external quality assessment for the analysis of thiopurine drugs: pitfalls and opportunities

Affiliations

• ¹ Dutch Foundation for Quality Assessment in Medical Laboratories (SKML), Section Therapeutic Drug Monitoring and Clinical Toxicology (KKGT), PO Box 43100, NL 2504 AC, The Hague, The Netherlands.
• ² Central Hospital Pharmacy, The Hague, The Netherlands.
• ³ Haga Teaching Hospital, The Hague, The Netherlands.
• ⁴ CAPHRI School for Public Health and Primary Care, Maastricht University, Maastricht, The Netherlands.
• ⁵ Department of Clinical Pharmacy and Toxicology, Maastricht University Medical Centre+, Maastricht, The Netherlands, Phone: +31-70-3217217, Fax: +31-70-3080140.
• ⁶ Dutch Foundation for Quality Assessment in Medical Laboratories (SKML), Section Therapeutic Drug Monitoring and Clinical Toxicology (KKGT), The Hague, The Netherlands.
• ⁷ Department of Clinical Pharmacy, Rijnstate Hospital, Arnhem, The Netherlands.
• ⁸ Dutch Foundation for Quality Assessment in Medical Laboratories (SKML), Nijmegen, The Netherlands.
• ⁹ Department of Clinical Pharmacy and Toxicology, Maastricht University Medical Centre+, Maastricht, The Netherlands.
• ¹⁰ University of Groningen, University Medical Center Groningen, Department of Clinical Pharmacy and Pharmacology, Groningen, The Netherlands.
• ¹¹ University of Groningen, Groningen Research Institute of Pharmacy, Department of Pharmacokinetics Toxicology and Targeting, Groningen, The Netherlands.