Five Iowa nursing homes have been added to a federal list of the nation’s worst care facilities. One of the five is a Sioux City home that, after being cited for violations tied to four resident deaths, is now in the process of voluntarily closing. The five homes are all deemed eligible for inclusion on the Centers for Medicare and Medicaid Services’ national list of “special-focus facilities.” They join five other Iowa care facilities already deemed eligible for inclusion on the periodic list of nursing homes that have recurring quality-of-care problems.