Hundreds of compelling stories that can be told by participants in the U.S. Transplant Games, the biennial event highlighting organ transplantation and donation that comes to Madison next weekend. More than 7,500 people are expected to be in town for the games, including 1,500 transplant athletes from 46 teams who will participate in 13 sports, said Krista Flanagan, the Transplant Games event manager in Madison. The state has two organ procurement organizations, the Wisconsin Donor Network and the UW Organ Procurement Organization, and four transplant centers ? Children?s Hospital of Wisconsin, Froedtert Hospital and Aurora St. Luke?s Medical Center, all in Milwaukee, and UW Hospital in Madison.