Inception cohort of the Swiss Spinal Cord Injury Cohort Study (SwiSCI): Design, participant characteristics, response rates and non-response oleh Christine Fekete, Beat Gurtner, Simon Kunz, Armin Gemperli, Hans-Peter Gmünder, Margret Hund-Georgiadis, Xavier Jordan, Martin Schubert, Jivko Stoyanov, Gerold Stucki