Evaluation of the serum-free light chain test in untreated patients with AL amyloidosis oleh Tilmann Bochtler, Ute Hegenbart, Christiane Heiss, Axel Benner, Friedrich Cremer, Martin Volkmann, Jochen Ludwig, Jolanta B. Perz, Anthony D. Ho, Hartmut Goldschmidt, Stefan O. Schonland