Views Read Edit View history. Hereditas published 6 April Estimating the size, growth rate, sex ratio , and age structure of North Korea 's population has been extremely difficult. During the s, health statistics, including life expectancy and causes of mortality, were gradually made available to the outside world. Ergonomics: The history and scope of human factors. So, all these changes took place only in the last two hundred years or so. And, this was definitely my challenge when I was a child. Korean emigration to the U.
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