 Complete the following phrase:  Christiansen participated only briefly in the a hrefBiathlon20Junior20World20Championships202013JuniorYouth World Championships in 2013a in Obertilliach. The championships started for Christiansen with the 10 km sprint event. He shot cleanly, but he finished outside the podium in fourth position. He did not start in the pursuit, nor did he enter any more events in the championships. Christiansen participated in the 