SWAT team members stand guard on the campus of Massachusetts General Hospital following the explosions at the finish line of the Boston Marathon. Michael Dwyer/AP hide caption

itoggle caption Michael Dwyer/AP

Medical personnel work outside the medical tent in the aftermath of two explosions near the finish line of the Boston Marathon on Monday. At area hospitals, doctors say they were confronted with the kinds of injuries U.S. troops get in Iraq and Afghanistan. Elise Amendola/AP hide caption

itoggle caption Elise Amendola/AP

Health and Human Services Secretary Kathleen Sebelius (center), flanked by Centers for Medicare and Medicaid Services Acting Administrator Marilyn Tavenner (left) and Food and Drug Administration Commissioner Margaret Hamburg, speaks during a budget briefing in Washington on Wednesday. Manuel Balce Ceneta/AP hide caption

itoggle caption Manuel Balce Ceneta/AP

Students at the College of Central Florida in Ocala, Fla., perform CPR on a mock patient. Bruce Ackerman/Ocala Star-Banner /Landov hide caption

itoggle caption Bruce Ackerman/Ocala Star-Banner /Landov

It's unlikely that July patients are paying for residents' inexperience with their lives. iStockphoto.com hide caption

itoggle caption iStockphoto.com

Walgreens is one of several pharmacies that have partnered with hospitals to help manage patients after they've returned home. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

About a third of U.S. hospitals have an observation unit, and most hospitals will eventually have one, the industry predicts. iStockphoto.com hide caption

itoggle caption iStockphoto.com

If you bought this 1954 Buick when it was new, the price was just about as mysterious as it is today for hip replacement surgery. Hugo90/Flickr hide caption

itoggle caption Hugo90/Flickr

When Superstorm Sandy came ashore, Bellevue Hospital was quickly submerged. Inspectors from the Federal Emergency Management Agency marked the flood line in the basement with orange tape or spray paint. In some areas, water was 14 feet deep. Fred Mogul/NPR hide caption

itoggle caption Fred Mogul/NPR

Doctors' use of CT head scans for hospitalized patients didn't change when the prices were revealed at the time an order was being made. Wikimedia Commons hide caption

itoggle caption Wikimedia Commons

Nurse Corean McClinton, left, talks about pain management with Sherry Webb at the Sickle Cell Disease Center in the Truman Medical Center, in Kansas City, Mo., in 2007. Dick Whipple/Associated Press hide caption

itoggle caption Dick Whipple/Associated Press

Physician assistants Scott Fillman (left) and Andrew Hunadi get ready to see patients with flu symptoms, in a tent erected just outside the emergency entrance at the Lehigh Valley Hospital in Allentown, Pa. Matt Rourke/AP hide caption

itoggle caption Matt Rourke/AP

Four-year-old Gabriella Diaz gets a flu shot at the Whittier Street Health Center in Boston, Mass., on Wednesday, the same day the city declared a public health emergency. Charles Krupa/ASSOCIATED PRESS hide caption

itoggle caption Charles Krupa/ASSOCIATED PRESS