 Complete the following phrase:  Switzerlands most successful athlete, and one of the most successful Paralympians of all times, is wheelchair athlete Heinz Frei, who since his début in 1984 has won fourteen gold medals, seven silver and eleven bronze, in track events, road cycling and cross-country skiing. He has, in particular, won the Paralympic marathon for his disability category on two occasions, in 1984 and in 1992. In addition, wheelchair athlete Franz Nietlispach, over the course of his career from 1976 to 2004, won fourteen gold medals, six silver and one bronze in track events, from sprinting to long distance running, as well as a bronze medal in road cycling. At the 1984 Games, he managed a virtually clean sweep of the six individual racing events he entered, winning gold in five, but taking only silver in the 100 metres, where he was beaten by D. Barret of the United States. At the 