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https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4082169/

https://jamanetwork.com/journals/jamadermatology/fullarticle/479409

https://www.researchgate.net/publication/318833540

https://www.sciencedirect.com/science/article/pii/S0022202X15327354

https://journals.lww.com/psychosomaticmedicine/Abstract/1998/09000/

https://www.pnas.org/content/109/supplement_2/17180.short