Serum levels of BAFF, but not APRIL, are increased after rituximab treatment in patients with primary Sjögren's syndrome: data from a placebo-controlled clinical trial. Issue 1 (31st July 2012) - Pollard, Rodney P E; Abdulahad, Wayel H; Vissink, Arjan; Hamza, Nishath; Burgerhof, Johannes G M; Meijer, Jiska M; Visser, Annie; Huitema, Minke G; Spijkervet, Fred K L; Kallenberg, Cees G M; Bootsma, Hendrika; Kroese, Frans G M