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携帯電話の使用に関するカリフォルニア州公衆衛生局の警告
Because mobile phones are a relatively recent addition to human history, long-term epidemiological data is still catching up to our daily habits. Recognizing this, major public health agencies such as the California Department of Public Health have begun issuing practical guidance based on the precautionary principle: taking simple, low-effort steps to reduce unnecessary exposure to radiofrequency energy today.