- Correspondence to Dr Jan D Reinhardt, Epidemiology of Functioning and Disability, Swiss Paraplegic Research, Guido A Zäch Str 4, Nottwil, Lucerne 6207, Switzerland;
- Received May 16, 2012
- Revised October 5, 2012
- Accepted November 12, 2012
- First published December 13, 2012.
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