Kyle RA, Child JA, Anderson K, Barlogie B, Bataille R, Bensinger W, Bladé J, Boccadoro M, Dalton W, Dimopoulos M, et al. Criteria for the classification of monoclonal gammopathies, multiple myeloma and related disorders: A report of the International Myeloma Working Group. British Journal of Haematology [Internet]. 2003;121(5):749 - 757.