<a href="https://news.yahoo.co.jp/expert/articles/c44eaac357dfba640fade75bbe73e715ceaf2cdb" target="_blank" rel="noopener nofollow">https://news.yahoo.co.jp/expert/articles/c44eaac357dfba640fade75bbe73e715ceaf2cdb</a><br><a href="https://www.bmj.com/content/371/bmj.m3862" target="_blank" rel="noopener nofollow">https://www.bmj.com/content/371/bmj.m3862</a>