https://www.dailynk.com/%e5%8c%97-%ed%8f%89%ec%96%91%ec%9d%98%eb%8c%80%eb%b3%91%ec%9b%90%ec%84%9c-%ec%9d%b8%ea%b3%b5%eb%ac%b4%eb%a6%8e%ea%b4%80%ec%a0%88-%ea%b0%9c/
北 "평양의대병원서 인공무릎관절 개발"