Tuberculosis prophylaxis in patients with steroid treatment and systemic rheumatic diseases. A case-control study - Hernández-Cruz, B; Ponce-de-León-Rosales, S; Sifuentes-Osornio, J; Ponce-de-León-Garduño, A; Díaz-Jouanen, E (Clin Exp Rheumatol, 1999)