Ronca, E
,
Scheel-Sailer, A
Koch, H G
Gemperli, A
Article History
Received: 4 January 2017
Revised: 11 March 2017
Accepted: 14 March 2017
First Online: 2 May 2017
Competing interests
: All authors were salaried by organizations financially compensated by the Swiss Paraplegic Foundation.