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- Departments of Clinical Pharmacy and Anesthesiology.
- Dotulabs, Weezenhof 3508, Nijmegen, The Netherlands.
- R.V.V. Kring 6, Wolfskuilseweg 279, Nijmegen, The Netherlands.
- Clinical Chemistry Laboratory, St. Radboud Hospital, University of Nijmegen, The Netherlands. Correspondence to Dr. T. B. Vree, Department of Clinical Pharmacy, Sint Radboud Hospital, University of Nijmegen, Geert Grooteplein Zuid 8, Nijmegen, The Netherlands.