Kawada, Tomoyuki, Department of Hygiene and Public Health, Nippon Medical School 1-1-5 Sendagi, Bunkyo-Ku, Tokyo 113-8602, Japan. Phone no. +81-3-3822-2131, E-mail: kawada@nms.ac.jp, Japan

• EXCLI Journal Vol. 20 (2021) - Letters to the editor
  COVID-19 infection and tobacco smoking
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