AUTHOR=Zhang Xiaodong TITLE=Much Higher Case-fatality Rates of Index Cases. Commentary: Differences in the Epidemiology of Human Cases of Avian Influenza A(H7N9) and A(H5N1) Viruses Infection JOURNAL=Frontiers in Public Health VOLUME=4 YEAR=2016 URL=https://www.frontiersin.org/journals/public-health/articles/10.3389/fpubh.2016.00116 DOI=10.3389/fpubh.2016.00116 ISSN=2296-2565