Heickendorff, L., Parvez, A., Bjerring, P., Halkier-Sørensen, L., & Zachariae, H. (1991). Serum aminoterminal propeptide of type III procollagen in systemic sclerosis. A follow-up--investigations in subclasses and during therapy. Acta Dermato-Venereologica, 71(3), 185–188. https://doi.org/10.2340/0001555571185188