Millions of Americans are having routine surgeries performed at the nation's 5,600-plus surgery centers, the small facilities that promise to get you in and out quickly, and at a much lower cost. But some of those facilities lack the staff or training to handle emergencies, and have been taking on increasingly fragile patients. It's a dangerous situation that has put patients' lives at risk and even children's lives at risk, a groundbreaking investigation by Kaiser Health News and USA Today Network discovered. Hundreds of patients, some as young as two, have died after having surgeries as simple as tonsillectomies or colonoscopies. And at least 7,000 patients a year had to be raced by ambulance to a local hospital when something went wrong.