Pedzisa mutsara unotevera: Jansen akaita kubudirira kwake kwenyika yose, apo akapiwa menduru yesirivha pa
2001 European Athletics U23 Championships. Makore mana gare gare, akauya ari wechishanu paEuropean Indoor Championship. Akakwikwidza kumaOlympics ezhizha ra2004 uye akabviswa mumakwikwi ekutanga.