 Complete the following phrase:  In the sport of Biathlon World Championship golds have been won by Kateřina Holubcová in the 15 kilometre individual event in 2003 and Roman Dostál in the 20 kilometre individual in 2005. More recently Gabriela Koukalová enjoyed a breakthrough season in 201213, scoring four World Cup wins. She subsequently took gold medals at the 2015 World Championships as part of the Czech mixed relay team, and at the 