International Dental Hygiene Educators' Forum,
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6324613/?fbclid=IwAR3ihZOx4bls99Ypz1eD5dGPFYGBIegC8-b8TBatpMopcF4PJgHnO4aRf4Y
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6324613/?fbclid=IwAR3ihZOx4bls99Ypz1eD5dGPFYGBIegC8-b8TBatpMopcF4PJgHnO4aRf4Y
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6324613/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6324613/