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Doctor examining X-rays. The doctor is using a light box to examine chest X-rays. The two already mounted on the light box are showing views of a patient's chest from the front (right) and from the side (left). The doctor is working in a hospital casualty department. Photographed at Lawrence General Hospital, Lawrence, Massachusetts, USA. (KEYSTONE/SCIENCE PHOTO LIBRARY/SAM OGDEN/SCIENCE PHOTO LIBRARY)