Intestinal dysbiosis in RA development: difficulty of establishing causality. Response to: 'Non-causal association of gut microbiome on the risk of rheumatoid arthritis: a Mendelian randomisation study' by Inamo.

Alpizar Rodriguez D Division of Rheumatology, Geneva University Hospitals, Geneva, Switzerland deshire_alpizar@hotmail.com.
Lesker TR Department of Microbial Immune Regulation, Helmholtz Centre for Infection Research, Braunschweig, Germany.
Gilbert B Division of Rheumatology, Geneva University Hospitals, Geneva, Switzerland.
Strowig T Department of Microbial Immune Regulation, Helmholtz Centre for Infection Research, Braunschweig, Germany.
Finckh A Division of Rheumatology, Geneva University Hospitals, Geneva, Switzerland.