A DJUSTED AGE - SPECIFIC CASE FATALITY RATIO DURING THE COVID-19 EPIDEMIC IN H UBEI , C HINA , J ANUARY AND F EBRUARY 2020. A P REPRINT. Julien Riou. Anthony Hauser. Institute of Social and Preventive Medicine University of Bern Bern, Switzerland julien.riou@ispm.unibe.ch.