One-year follow-up of mud-bath therapy in patients with bilateral knee osteoarthritis: a randomized, single-blind controlled trial.

Fioravanti A, Bacaro G, Giannitti C, Tenti S, Cheleschi S, Gui Delli GM, Pascarelli NA, Galeazzi M.
Int J Biometeorol. 2015 Sep;59(9):1333-43. doi: 10.1007/s00484-014-0943-0. Epub 2014 Dec 17

https://www.ncbi.nlm.nih.gov/pubmed/25516113