Focus on kidney disease among the coronavirus disease 2019 patients: A comparative perspective between China, Italy and the United States.

Coronavirus disease 2019 (COVID-19) has rapidly spread to more than 200 countries and areas. As of May 11, 2020, more than 4 million cases have been confirmed globally and more than 280000 deaths have been recorded. In China, Italy and America, the mortality was 5.5% (4644/84451), 14.0% (30739/219814) and 6.1% (78652/1298287), respectively.1.