Funding for this research was provided by:
Agencia Nacional de Investigación y Desarrollo (COVID1032)
Received: 12 March 2021
Accepted: 30 March 2021
First Online: 15 April 2021
: The RUCAS project is approved and annually revised by the Institutional Review Board of the Faculty of Medicine of Pontificia Universidad Católica de Chile (ID 170727004). Participation is voluntary and confidential, and informed consent is signed at enrollment. Data has been de-identified, and its transfer and storage adhere to usual standards of privacy and data protection.
: Not applicable.
: The authors declare that they have no competing interests.