[BMJ Publishing Group Ltd and European League Against Rheumatism 37th European Workshop for Rheumatology Research 2–4 March 2017 Athens, Greece - ()] Pathogenic stroma - 04.16 Tnf/tnfr2 signalling in mesenchymal cells of joints and aortic heart valves is aetiopathogenic for comorbid arthritis and heart valve disease developing in the tnf Δare/+ mouse model