sPinal coRd stimulatiOn coMpared with lumbar InStrumEntation for low back pain after previous lumbar decompression (PROMISE): a prospective multicentre RCT oleh Ehab Shiban, Jens Lehmberg, Philipp Krauss, Stefan Motov, Maximilian Niklas Bonk, Andrea Prescher, Jasmin Scorzin, Mohammad Mehdi Hajiabadi, Dirk Michael Schulte, Bjoern Sommer, Marcel Seiz-Rosenhagen, Rezvan Ahmadi, Jaroslaw Maciaczyk