Association of FokI polymorphism of the VDR gene with systemic lupus erythematosus in an adolescent population of the Colombian Caribbean Gloria Garavito; Luis Fang; Alex Domínguez-Vargas; Ana Moreno-Woo; Guillermo López-Luch; Antonio Iglesias; Gustavo Aroca; Eduardo Egea;

Association between vitamin D deficiency and disease activity in Paraguayan patients with systemic lupus erythematosus Isabel Acosta-Colman; Zoilo Morel; Astrid Paats; Nelson Ortíz; Lourdes Román; Marcos Vázquez; Margarita Duarte; Gabriela Ávila-Pedretti; María Eugenia Acosta; María Teresa Martínez de Filártiga;

Vitamin D deficiency in patients with spondyloarthritis in a Spanish (Castilla-La Mancha) hospital David Castro Corredor; Marco Aurelio Ramírez Huaranga; María Dolores Mínguez Sánchez; Miguel Luque Zafra; José Luis Cuadra Díaz;