Funding for this research was provided by:
Received: 28 November 2019
Accepted: 12 February 2020
First Online: 18 February 2020
Ethics approval and consent to participate
: Recruitment of volunteers for bone marrow collection, procedures and documentation were approved by the ethics committee of Maastricht University Medical Center (METC 13–2-032). The ethics committee for Animal Care of the <i>Hospital Nacional de Parapléjicos</i> reviewed experimental protocol, surgical procedures and post-operational care (163CEEA/2017), which were subsequently approved by the <i>Consejería de Agricultura y Ganadería de Castilla-la Mancha</i> (ref. 210498).
: Not applicable.
: JdM and EChW are CEOs and owners of Neuroplast BV.