https://www.ncbi.nlm.nih.gov/pubmed/26353942

https://www.ncbi.nlm.nih.gov/pubmed/26449290

https://www.jendodon.com/article/S0099-2399(18)30288-7/fulltext

https://www.jendodon.com/article/S0099-2399(18)30088-8/abstract