AUTHOR=Cummins Nicholas , Schuller Björn W. TITLE=Five Crucial Challenges in Digital Health JOURNAL=Frontiers in Digital Health VOLUME=2 YEAR=2020 URL=https://www.frontiersin.org/journals/digital-health/articles/10.3389/fdgth.2020.536203 DOI=10.3389/fdgth.2020.536203 ISSN=2673-253X