Text and Data Mining valid from 2018-11-13
Received: 17 October 2018
Accepted: 1 November 2018
First Online: 13 November 2018
Compliance with ethical standards
: LB has received speaker honarium from Spineart and consultancy from Medicrea. IO has received consultancy honorarium from Medtronic and Depuy-Synthes, and royalties from Spineart, Clarence and Alphatec. IO and LB institution received grant from Depuy Synthes.