A Combination of CD28 (rs1980422) and IRF5 (rs10488631) Polymorphisms Is Associated with Seropositivity in Rheumatoid Arthritis: A Case Control Study. oleh Lucia Vernerova, Frantisek Spoutil, Miroslav Vlcek, Katarina Krskova, Adela Penesova, Milada Meskova, Andrea Marko, Katarina Raslova, Branislav Vohnout, Jozef Rovensky, Zdenko Killinger, Ivana Jochmanova, Ivica Lazurova, Guenter Steiner, Josef Smolen, Richard Imrich