Genetic variants of STAT4 associated with rheumatoid arthritis in persons of Asian and European ancestry do not replicate in African Americans. Issue 4 (17th March 2010) - Kelley, James M; Hughes, Laura B; Malik, Ashima; Danila, Maria I; Edberg, Yuanqing; Alarcón, Graciela S; Conn, Doyt L; Jonas, Beth L; Callahan, Leigh F; Smith, Edwin A; Brasington, Richard D; Edberg, Jeffrey C; et al.