Funding for this research was provided by:
swedish foundation for international cooperation in research and higher education (SG 2015-5972)
alf-grants, region östergötland (LIO-793191, LIO-899871)
Received: 10 August 2021
Accepted: 31 October 2021
First Online: 20 November 2021
: Ethics approval for this study was granted by the Ethics Committee of the Vietnam National Children’s Hospital (reference number: VNCH-RICH-16-014 with approved extension/appendix). Caretakers, legal guardians, and relatives of the patients included in this study were given the opportunity to opt out of the study at any time.
: In this study, no individually identifiable data are included, all data are presented as pooled data. As such, consent for publication was not required. Nonetheless, caretakers, legal guardians, and relatives of all included patients were fully informed of the conditions of the study and were given the opportunity to opt out of the study at any time.
: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.