Anagnostopoulos A, Gika D, Symeonidis A, Zervas K, Pouli A, Repoussis P, Grigoraki V, Anagnostopoulos N, Economopoulos T, Maniatis A, et al. Multiple myeloma in elderly patients: Prognostic factors and outcome. European Journal of Haematology [Internet]. 2005;75(5):370 - 375.