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Study of diaries kept by Eric Marshall, medical officer to the 1907–09 expedition, suggests that Shackleton suffered from an atrial septal defect ("hole in the heart"), a congenital heart defect, which may have been a cause of his health problems.  | Study of diaries kept by Eric Marshall, medical officer to the 1907–09 expedition, suggests that Shackleton suffered from an atrial septal defect ("hole in the heart"), a congenital heart defect, which may have been a cause of his health problems.  | ||
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