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Petrassi A, Chiu M, Porada K, Johnston B, Toppe M, Oldani M, Kaeppler C.Petrassi A, et al. Among authors: johnston b.WMJ. 2022 Jul;121(2):145-148.WMJ. 2022.PMID: 35857691Free article.
Cory M, Johnston B, Nelson D.Cory M, et al. Among authors: johnston b.J Sch Health. 2021 Dec;91(12):1024-1029. doi: 10.1111/josh.13091. Epub 2021 Oct 5.J Sch Health. 2021.PMID: 34611911
Bernstein RS, Johnston B, Mackay K, Sanders J.Bernstein RS, et al. Among authors: johnston b.J Public Health Dent. 2019 Sep;79(3):193-197. doi: 10.1111/jphd.12331. Epub 2019 Aug 6.J Public Health Dent. 2019.PMID: 31389017