Funding for this research was provided by:
National Institutes of Health (1R01HL120725, R01-HL-093009, UL1 RR024131)
Received: 18 January 2020
Accepted: 3 August 2020
First Online: 11 September 2020
Ethics approval and consent to participate
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki. The study protocol was approved by the institutional review boards of University of California, San Francisco and Northwestern University. All participants signed informed consent forms before undergoing study procedures.
: Not applicable.
: The authors declare that they have no competing interests.