Funding for this research was provided by:
National Institutes of Health (1U2CEB021881)
Received: 19 July 2018
Accepted: 13 December 2018
First Online: 16 January 2019
Compliance with ethical standards
: Yaguang Zheng, Susan M. Sereika, Lora E. Burke, Jeffrey E. Olgin, Gregory M. Marcus, Kirstin Aschbacher, Geoffrey H. Tison, Mark J. Pletcher declare that he/she has no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of Institutional Review Board approval at UCSF and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. This secondary analysis was also approved by the Institutional Review Board at Boston College. Informed consent was obtained from all individual participants included in the study. All participants provided remote, digital informed consent.