Relationship between mask wearing, testing, and vaccine willingness among Los Angeles County adults during the peak of the COVID-19 pandemic.

"Conflicts of Interest: Chun Nok Lam, Cameron Kaplan, and Sonali Saluja declare that they have no conflicts of interest."

"Funding This study was funded by the W. M. Keck Foundation."

"Compliance with Ethical Standards: Conflicts of Interest: Chun Nok Lam, Cameron Kaplan, and Sonali Saluja declare that they have no conflicts of interest.: Human Rights: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.: Informed Consent: Informed consent was obtained from all individual participants included in the study.: Study Registration: This study was not formally registered.: Analytic Plan Pre-registration: The analysis plan was not formally preregistered."