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Siewe, Jan, Otto, Christina, Knoell, Peter, Koriller, Marco, Stein, Gregor 
ORCID: 0000-0002-0443-4573, Kaulhausen, Thomas, Eysel, Peer, Zarghooni, Kourosh ORCID: 0000-0001-7069-6291, Franklin, Jeremy ORCID: 0000-0003-1536-0925 and Sobottke, Rolf
(2011).
Comparison of standard fusion with a topping off system in lumbar spine surgery: a protocol for a randomized controlled trial.
BMC Musculoskelet. Disord., 12.
LONDON:
BMC.
ISSN 1471-2474