Multicenter study of ZAP-70 expression in patients with B-cell chronic lymphocytic leukemia using an optimized flow cytometry method oleh Nathalie Gachard, Aurélie Salviat, Catherine Boutet, Christine Arnoulet, Françoise Durrieu, Bernard Lenormand, Stéphane Leprêtre, Sylviane Olschwang, Fabrice Jardin, Marina Lafage-Pochitaloff, Dominique Penther, Danielle Sainty, Liliane Reminieras, Jean Feuillard, Marie C. Béné