HLA-DPB1 and DPB2 are genetic loci for systemic sclerosis: A genome-wide association study in Koreans with replication in North Americans. - Zhou X; Lee JE; Arnett FC; Xiong M; Park MY; Yoo YK; Shin ES; Reveille JD; Mayes MD; Kim JH; Song R; Choi JY; et al. (Arthritis & Rheumatism, 2009)