Bamias A, Tzannis K, Beuselinck B, Oudard S, Escudier B, Diosynopoulos D, Papazisis K, Lang H, Wolter P, De Guillebon E, et al. Development and validation of a prognostic model in patients with metastatic renal cell carcinoma treated with sunitinib: A European collaboration. British Journal of Cancer [Internet]. 2013;109(2):332 - 341.