[1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3107005/
[2] https://www.webmd.com/heart-disease/news/20100909/stress-hormone-predicts-heart-death#1
[3] https://www.ncbi.nlm.nih.gov/pubmed/8807563
[4] https://www.ncbi.nlm.nih.gov/pubmed/16353426
[5] https://www.ncbi.nlm.nih.gov/pubmed/22495883
[6] https://www.ncbi.nlm.nih.gov/pubmed/6538617
[7] https://www.ncbi.nlm.nih.gov/pubmed/3573976
[8] https://www.ncbi.nlm.nih.gov/pubmed/29466592
[9] https://www.ncbi.nlm.nih.gov/pubmed/3106181
[10] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5054608/
[11] https://www.ncbi.nlm.nih.gov/pubmed/18401805
[12] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3661116/
[13] https://www.ncbi.nlm.nih.gov/pubmed/21939733
[14] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3268700/
[15] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3407788/
[16] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5551442/