Prognostic impact of blood and urinary angiogenic factor levels at diagnosis and during treatment in patients with osteosarcoma: a prospective study за авторством Marie-Dominique Tabone, Laurence Brugières, Sophie Piperno-Neumann, Marie-Ange Selva, Perrine Marec-Bérard, Hélène Pacquement, Cyril Lervat, Nadège Corradini, Jean-Claude Gentet, Rémy Couderc, Aurélie Chevance, Céline Mahier-Ait Oukhatar, Natacha Entz-Werle, Jean-Yves Blay, Marie-Cecile Le Deley