- Correspondence to Dr Jenny T van der Steen, Department of general practice & elderly care medicine, VU University Medical Center, EMGO Institute for Health and Care Research, Van der Boechorststraat 7, Amsterdam 1081 BT, The Netherlands;
- Received June 27, 2012
- Revised September 26, 2012
- Accepted October 16, 2012
- First published November 10, 2012.
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