1. Pharmacy Foundation of Haarlem Hospitals, Boerhaavelaan 24, 2035 RC Haarlem, The Netherlands
2. Department of Clinical Pharmacy, Spaarne Gasthuis Hospital, Boerhaavelaan 22, 2035 RC Haarlem, The Netherlands
3. Department of Clinical Pharmacy and Pharmacology, University Medical Center Groningen, University of Groningen, P.O. Box 30.001, 9700 RB Groningen, The Netherlands
4. Community Pharmacy BENU Pharmacy Nieuwpoort, Jan van der Heydenweg 352, 3401 RJ IJsselstein, The Netherlands
5. Department of Haematology, University Medical Center Groningen, University of Groningen, P.O. Box 30.001, 9700 RB Groningen, The Netherlands
6. Nivel, Netherlands Institute for Health Services Research, P.O. Box 1568, 3500 BN Utrecht, The Netherlands