- Correspondence to Josien Riphagen-Dalhuisen, University of Groningen, Department of Pharmacy, Division of Pharmacoepidemiology and Pharmacoeconomics, PO Box XB45, Antonius Deusinglaan 1, 9713 AV Groningen, The Netherlands;
- Accepted November 2, 2011
- First published December 15, 2011.
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