Prolonged effects of 3 week therapy in a spa resort on lumbar spine, knee and hip osteoarthritis: follow-up after 6 months. A randomised controlled trial.

M Nguyen, M Revel, M Dougados
Rheumatology, Volume 36, Issue 1, Jan 1997, Pages 77–81

https://academic.oup.com/rheumatology/article/36/1/77/1779072