Efficacy of hydrotherapy in fibromyalgia syndrome–a meta-analysis of randomized controlled clinical trials.

Langhorst J1, Musial F, Klose P, Häuser W.
Rheumatology (Oxford). 2009 Sep;48(9):1155-9. doi: 10.1093/rheumatology/kep182. Epub 2009 Jul 16

https://www.ncbi.nlm.nih.gov/pubmed/19608724