Comorbidity, disability, and healthcare expenditure of ankylosing spondylitis in Korea: A population-based study.Published in:PLoS ONE, 2018, v. 13, n. 2, p. 1, doi. 10.1371/journal.pone.0192524By:Lee, Jeong Seok;Oh, Baek-Lok;Lee, Hee Young;Song, Yeong Wook;Lee, Eun YoungPublication type:Article