International Myeloma Working Group guidelines for serum-free light chain analysis in multiple myeloma and related disorders - Dispenzieri, A; Kyle, R; Merlini, G; Ludwig, H; Hajek, R; Palumbo, A; Jagannath, S; Blade, J; Lonial, S; Dimopoulos, M; Comenzo, R; Einsle, H; Barlogie, B; Anderson, K; Gertz, M; Harousseau, JL; Attal, M; Tosi, P; Sonneveld, P; Boccadoror, M; Morgan, G; Richardson, P; Sezer, O; Mateos, MV; Cavo, M; Joshua, D; Turesson, I; Chen, W; Shimizu, K; Powles, R; Rajkumar, SV; Durie, BGM (Leukenia, 2009)