[1] Norwegian Radium Hosp, Dept Pathol, N-0310 Oslo, Norway
[2] Univ Oslo, Inst Canc Res, Oslo, Norway
[3] Med Univ, Dept Pathol, Varna Bulgaria, Bulgaria
[4] Norwegian Radium Hosp, Dept Gynecol, Oslo, Norway
[5] Med Univ, Dept Immunol & Microbiol, Varna Bulgaria, Bulgaria