1. Amor B, Kahan A, Dougados M, et al. Sulfasalazine and ankylosing spondylitis. Ann Intern Med. 1984;101(6):878.
2. Tu L, Rai JC, Cao S, et al. Costs and work limitation of patients with ankylosing spondylitis in China. Clin Exp Rheumatol. 2014;32(5):661–6.
3. Zongyu W, Lunhui L. Chinese raw materials botanicals. China, Yunnan. Yunnan Science and Technology Press. 2002;203:333.
4. Yaofeng H, Xuesong S, Shengjiu G, et al. Analysis on Similarity of Chemical Compositions of between Tripterygium wilfordii Hook.f. and Tripterygium hypoglaucum(Levl) Hutchins. J Anhui AgriSci. 2009;37(13):5961–3.
5. Ji W, Li J, Lin Y, et al. Report of 12 cases of ankylosing spondylitis patients treated with Tripterygium wilfordii. Clin Rheumatol. 2010;29(9):1067–72.