Funding for this research was provided by:
National Institutes of Health (R21MH121876-01)
Received: 14 September 2020
Accepted: 26 January 2021
First Online: 27 May 2021
Ethics approval and consent to participate
: This research study was approved by the Stanford University Institutional Review Board. This was a secondary data analysis of existing, publicly available databases, each of which encompassed a range of individual studies. Individual studies employed distinct recruitment and consenting process, inclusionary and exclusionary criteria, and incentivization approaches and strategies. All participants implicitly or explicitly consented for their anonymized data to be added to the database and publicly shared.
: Not applicable.
: The authors declare that they have no competing interests.