Received: 16 January 2020
Accepted: 12 April 2021
First Online: 3 May 2021
: This study protocol was approved by the Human Subjects Protection Committee at the RAND Corporation. This committee serves as RAND’s Institutional Review Board to review research involving human subjects, as required by federal regulations (FWA00003425).
: Not applicable.
: The author declares that they have no competing interests.