Funding for this research was provided by:
Lee Kum Sheung Center for Health and Happiness, Harvard University T H Chan School of Public Health (NA)
Text and Data Mining valid from 2019-06-26
Received: 1 February 2019
Accepted: 12 June 2019
First Online: 26 June 2019
Ethics approval and consent to participate
: Written informed consent was provided by all participants. All study methods and procedures were reviewed and approved by the Harvard T.H. Chan School of Public Health Institutional Review Board (IRB approval number IRB16–1859).
: All participants provided written consent for publication.
: The authors declare that they have no competing interests.