1. Dutch Institute for Rational Use of Medicines, Churchillaan 11, 3527 GV Utrecht, The Netherlands
2. College voor zorgverzekeringen (Health Care Insurance Board), Eekholt 4, 1112 XH Diemen, The Netherlands
3. Institute for Pharmacological Research ‘Mario Negri’, Via Giuseppe La Masa 19, 20156 Milan, Italy.
4. Centre for Primary Care: Institute of Population Health, University of Manchester, UK
5. Strathclyde Institute for Pharmacy and Biomedical Sciences, University of Strathclyde, Glasgow, UK
6. Information Services Division, NHS National Services Scotland, Edinburgh, UK
7. Department of Laboratory Medicine, Division of Clinical Pharmacology, Karolinska Institutet, Karolinska University Hospital Huddinge, SE-141 86, Stockholm, Sweden