Elegance, style and rhythm lead to a winning dance routine. Wheelchair Dance Sport involves athletes with a physical disability that affects the lower limbs. Wheelchair dancers may participate in "combi"-style dancing with an able-bodied (standing) partner or duo-dance for two wheelchair users together. Standard dances include the waltz, tango, Viennese waltz, slow foxtrot and quickstep. Latin-American dances include the samba, cha-cha-cha, rumba, paso doble and jive. There are also Formation dances for four, six or eight couples dancing in formation. In 1977, the first international competition in Wheelchair Dance Sport took place in Sweden. After several regional and international competitions, the first World Championships were organized in Japan in 1998. The same year, Wheelchair Dance Sport became an IPC Championship Sport, but is not part of the Paralympic programme today. It is governed by the International Paralympic Wheelchair Dance Sport Committee (IPWDSC) following the modified rules of the International Dance Sport Federation (IDSF) and is widely practiced by athletes in 19 countries.