New paper examining this link:
Front. Endocrinol., 11 January 2019 | doi.org/10.3389/fendo.2018....
Increased Risk of Thyroid Dysfunction Among Patients With Rheumatoid Arthritis
Qian Li, Bin Wang, Kaida Mu, Jing Zhang, Yanping Yang, Wei Yao, Jie Zhu and Jin-an Zhang*
Department of Endocrinology, Jinshan Hospital of Fudan University, Shanghai, China
Department of Endocrinology & Rheumatology, Affiliated Zhoupu Hospital, Shanghai University of Medicine and Health Sciences, Shanghai, China