Study of vitamin D status of rheumatoid arthritis patients Rationale and design of a cross-sectional study by the osteoporosis and metabolic bone diseases study group of the Italian Society of Rheumatology (SIR). Reumatismo, [S. l.], v. 58, n. 4, p. 314–318, 2006. DOI: 10.4081/reumatismo.2006.314. Disponível em: https://www.reumatismo.org/reuma/article/view/reumatismo.2006.314. Acesso em: 10 may. 2025.