RT Journal Article SR Electronic T1 EXTERNAL QUALITY CONTROL – THROUGH QUALIFICATION TESTS AND SLIDES EXCHANGE JF International Journal of Gynecologic Cancer JO Int J Gynecol Cancer FD BMJ Publishing Group Ltd SP 178 OP 178 DO 10.1136/ijgc-00009577-200409001-00640 VO 14 IS Suppl 1 A1 Kostova, P. A1 Zlatkov, V. A1 Ganchev, G. A1 Maslev, P. YR 2004 UL http://ijgc.bmj.com/content/14/Suppl_1/178.2.abstract