Response to: 'Tapering without relapse in rheumatoid arthritis patients with high TNF blocker concentrations: data from the STRASS study' by Marotte et al. Issue 7 (9th May 2019) - l'Ami, Merel J; Krieckaert, Charlotte L; Nurmohamed, Michael T; van Vollenhoven, Ronald F; Rispens, Theo; Boers, Maarten; Wolbink, Gerrit Jan