U.S. Navy doctors Lt. Cmdr Ralph Pickard (left) and Ens. Jesse Rohloff study a patient's mammogram images at the National Naval Medical Center in Bethesda, Md. CWO4 Seth Rossman/U.S. Navy hide caption

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CWO4 Seth Rossman/U.S. Navy

Striking a pose like Hamlet, Kofi Boahene, a surgeon at Johns Hopkins Hospital, peers through the natural opening under the cheekbone and above the jaw that he uses for surgery. Keith Weller/Courtesy of Johns Hopkins Medicine hide caption

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Keith Weller/Courtesy of Johns Hopkins Medicine

Wal-Mart's Dr. John Agwunobi (left) said in a statement that the company won't be "building a national, integrated, low-cost primary care health care platform." Even so, the leaves plenty of room for the retailer to pursue an expansion of health care services at its stores. Cliff Owen/AP hide caption

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Cliff Owen/AP

Wal-Mart Plans Ambitious Expansion Into Medical Care

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Husband and wife team Jerome Groopman and Pamela Hartzband collaborated on Your Medical Mind. Hartzband is an endocrinologist. Groopman is an oncologist, New Yorker staff writer and author of How Doctors Think.

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Shelly Harrison Photography