In this image released by Ottawa Hospital Research Institute, Dr. May Griffith displays a biosynthetic cornea that can be implanted into the eye to repair damage and restore sight in Ottawa, Canada, in 2005. Scientists have created a new kind of artificial cornea, inserting a sliver of collagen into the eye that coaxes its own natural corneal cells to regrow and restore vision. (AP Photo/Ottawa Hospital Research Institute)
A woman leaves the almost deserted Hillbrow Community Health Center in Johannesburg, Wednesday, Aug. 25, 2010. Doctors and activists say AIDS patients aren't getting treated because of a nationwide strike in the country, which has the highest incidence of the virus that causes AIDS. (AP Photo/Denis Farrell)
OTTAWA HOSPITAL RESEARCH INSTITUTE VIA ASSOCIATED PRESS
Dr. May Griffith of the Ottawa Hospital Research Institute in Canada displays in 2005 a biosynthetic cornea that, implanted into the eye, coaxes the eye's natural corneal cells to regrow.
A sick Pakistani's bed sits outside Tuesday for lack of room at a rural health center in a flood-affected district of Punjab province. Hundreds of health facilities have been damaged by flooding. (Associated Press)
FILE - In this file photo of May 15, 2003 Romanian patients sit on their beds in the city hospital in Odobesti, northern Romania. No sutures and other basics; a dire shortage of staff; catastrophic hygiene; then this _ a hospital blaze that killed five premature babies. Romania's hospital system is on the ropes. Romania's hospitals were a nightmare under communism which ended in 1989. But more than two decades after communist rule was toppled and almost four years after it joined the EU, Romania remains one of Europe's poorest countries _ and the sorry state of its hospitals reflect that status. (AP Photo/Karina Knapek, File)
A billboard advertising emergency room wait times is seen along Interstate 64 near downtown Richmond, Va., Friday, Aug. 20, 2010. ER visits hit a new high of more than 123 million in 2008, up from 117 million a year earlier, says preliminary data released this month by the Centers for Disease Control and Prevention. Online, via text message or flashing on a billboard, some emergency rooms are advertising how long the dreaded wait for care will be, with estimates updated every few minutes. (AP Photo/Steve Helber)
Senate candidate Joe Miller has been campaigning door to door in Anchorage, Alaska. Mr. Miller has the support of the "tea party" movement and the backing of former Alaska Gov. Sarah Palin. (Associated Press)
U.S. soldiers shield themselves from the rotor wash of a medevac helicopter as it takes off with patients in the Zhari district of Kandahar province in southern Afghanistan on Friday, Aug. 20, 2010. (AP Photo/Brennan Linsley)
In this Tuesday, July 13, 2010, picture, Dr. Ulrich Wernery checks the health of a camel at the Camelicious farm in Dubai, United Arab Emirates. Camel milk has at least three times more vitamin C than a cow's and is considered an alternative for the lactose intolerant. Researchers, meanwhile, have studied possible roles in fighting bacteria, tumors and diabetes, as well as traditional uses such as a treatment for liver disease as part of folk medicine across the camels range from central Asia to North Africa. (AP Photo/Kamran Jebreili)
First lady Michelle Obama harvests vegetables in the White House garden on the South Lawn in June with the help of children from Hollin Meadows Elementary School in Alexandria, Va. Mrs. Obama launched a campaign against childhood obesity.
In this Aug. 15, 2010 photo, U.S. Army soldiers from C Co., 4th Battalion, 9th Infantry Regiment, 2nd Infantry Division gather for inspection of their night-vision and equipment before driving from Iraq to Kuwait. The soldiers are the last combat brigade to leave Iraq as part of the drawdown of U.S. forces. (AP Photo/ Maya Alleruzzo)
U.S. Army soldiers from 2nd Battalion, 23rd Infantry Regiment, 4th Brigade, 2nd Infantry Division race toward the border from Iraq into Kuwait Wednesday, Aug. 18, 2010. The soldiers are part of the last combat brigade to leave Iraq as part of the drawdown of U.S. forces. (AP Photo/ Maya Alleruzzo)
U.S. Army soldiers from C Co., 4th Battalion, 9th Infantry Regiment, 2nd Infantry Division gather Saturday for a formation before driving from Iraq to Kuwait. The soldiers are the last combat brigade to leave Iraq as part of the drawdown of U.S. forces. (Associated Press)
Dr. David Nichols, talks with visitors as he sits in the old Health Clinic on Tangier Island, Va., Monday, Aug. 9, 2010. A brand new clinic is scheduled to open on Aug. 29. Dr. Nichols, who has been flying to Tangier to care for the residents for 30 years, has been diagnosed with terminal cancer. (AP Photo/Richmond Times-Dispatch, Bob Brown)
This aerial view shows Tangier Island, Va. surrounded by the Chesapeake Bay, Monday, Aug. 9, 2010. For more than 30 years, Dr. David Nichols has piloted a plane or a helicopter across the Chesapeake Bay on his day off each week to provide medical care to this community of 500 that has no resident physician. (AP Photo/Richmond Times-Dispatch, Bob Brown)