Funding for this research was provided by:
Nederlandse Organisatie voor Wetenschappelijk Onderzoek (W80.25.302)
Received: 28 April 2021
Accepted: 23 December 2021
First Online: 11 April 2022
: 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. The study was approved by the Institutional Ethics Committee of Hue University of Medicine and Pharmacy in Vietnam (registration number H2018/010). Written informed consent was obtained from all individual participants included in the study (see overview of respondents in Table InternalRef removed). No interviews were done with children.
: Not applicable.
: The authors declare that they have no competing interests.