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Sources:
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.201.5865&rep=rep1&type=pdf
http://www.merckmanuals.com/professional/dental-disorders/symptoms-of-dental-and-oral-disorders/recurrent-aphthous-stomatitis
http://www.mayoclinic.org/diseases-conditions/canker-sore/basics/treatment/con-20021262
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4002348/
http://www.medscape.com/viewarticle/582101_2
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2710437/
https://cda-adc.ca/jcda/vol-75/issue-7/533.pdf
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3227248/