2007, Long-term benefit of radon spa therapy in the rehabilitation of rheumatoid arthritis: A randomized, double blind trial

Franke A, Reiner L, Resch KL:

Rheumatol. Int. 2007;27:703-713. doi: 10.1007/s00296-006-0293-2.

https://pubmed.ncbi.nlm.nih.gov/17203297/