2018, Effects of balneotherapy and spa therapy on levels of cortisol as a stress biomarker: a systematic review.

Antonelli M, Donelli D.

Int J Biometeorol. 2018;62(6): 913-924. doi: 10.1007/s00484-018-1504-8.

https://pubmed.ncbi.nlm.nih.gov/29455296/