Anti-interleukin-6 receptor antibody therapy favors adrenal androgen secretion in patients with rheumatoid arthritis: a randomized, double-blind, placebo-controlled study - Straub, R H; Harle, P; Yamana, S; Matsuda, T; Takasugi, K; Kishimoto, T; Nishimoto, N (Arthritis Rheum, 2006)