Engkilde, Kaare, Jacob P. Thyssen, Nannie Bangsgaard, Torkil Menné, and Jeanne D. Johansen. 2011. “Inverse Association Between Rheumatoid Arthritis and Contact Allergy”. Acta Dermato-Venereologica 92 (2):175-76. https://doi.org/10.2340/00015555-1205.