Every day — and through the night — in Sioux Falls, South Dakota, doctors report to work in a hospital where there are no patients. And in over 70 rural communities in four states, patients stricken by heart attacks, or injured in car accidents, or facing other urgent health issues are rushed to an E.R. where there are no doctors. Or, more precisely, there’s one doctor. More often than not, he or she is trained in family practice, not emergency care. And if the call’s coming in the middle of the night, he legally has a half-hour to get out of bed and report in. Read more here .