The Nordic Aortic Valve Intervention (NOTION) trial comparing transcatheter versus surgical valve implantation: study protocol for a randomised controlled trial oleh Thyregod Hans Gustav, Søndergaard Lars, Ihlemann Nikolaj, Franzen Olaf, Andersen Lars Willy, Hansen Peter Bo, Olsen Peter Skov, Nissen Henrik, Winkel Per, Gluud Christian, Steinbrüchel Daniel Andreas