Erratum: CellKine clinical trial: first report from a phase 1 trial of allogeneic bone marrow-derived mesenchymal stem cells in subjects with painful lumbar facet joint arthropathy: Erratum.

Dan Yan, Abba C Zubair, Michael D Osborne, Robert Pagan-Rosado, Jeffrey A Stonec, Vance T Lehman, Nisha C Durand, Eva Kubrova, Zhen Wang, Drew M Witter, Meghan M Baer, Gabriela C Ponce, Alfredo Quiñones-Hinojosa, Wenchun Qu