Funding for this research was provided by:
Umea University
Article History
Accepted: 13 January 2022
First Online: 26 January 2022
Declarations
:
: The study protocol was approved by Regional Ethical Board for Medical Research, Umeå, Sweden (Dnr 2017–20-31 M). Informed written consent was obtained from the parents, or custodians, on behalf of their child.
: Not applicable.
: Svante Twetman serves as medical expert for education within the BioGaia Academy. He has also lectured for the company on the use of probiotics for oral health. The other authors declare no conflict of interest.