Bagnato, G., Ruggeri, R., Certo, R., Piccione, C., Carerj, S., & Roberts, W. (1969). Serum thyroxine levels are associated with increased systolic pulmonary arterial pressure in systemic sclerosis. Clinical and Experimental Rheumatology, 35 Suppl 106(4), 220. Retrieved from http://www.clinexprheumatol.org/pubmed/find-pii.asp?pii=28598782 (Original work published 1969)