Identification of 2 DNA methylation subtypes of Waldenström macroglobulinemia with plasma and memory B-cell features by Roos-Weil, D, Giacopelli, B, Armand, M, Della-Valle, V, Ghamlouch, H, Decaudin, C, Metzner, M, Lu, J, Le Garff-Tavernier, M, Leblond, V, Vyas, P, Zenz, T, Nguyen-Khac, F, Bernard, OA, Oakes, CC