AUTHOR=Osborne Vicki , Shakir Saad A. W. 

TITLE=What Is the Difference Between Observed Association and Causal Association, Signals and Evidence? Examples Related to COVID-19

JOURNAL=Frontiers in Pharmacology

VOLUME=11

YEAR=2021

URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2020.569189

DOI=10.3389/fphar.2020.569189

ISSN=1663-9812