Improving shared decision-making in vascular surgery by implementing decision support tools: study protocol for the stepped-wedge cluster-randomised OVIDIUS trial. - S. M. L. de Mik; F. E. Stubenrouch; D. A. Legemate; R. Balm; Dirk T. Ubbink (BMC Medical Informatics Decis. Mak., 2020)