• Kyodo

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Working more than 60 hours a week and constant sleep deprivation may double the risk of having a heart attack, according to a survey conducted by researchers at Japan’s National Cancer Center.

The study, published in the British medical journal Occupation and Environmental Medicine, looked at 260 Japanese men between the ages of 40 and 79 who had survived a first-time heart attack, comparing them with a group of 445 men with no heart attack history.

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