[1] NCI, Bethesda, MD 20892 USA
[2] German Canc Res Ctr, Heidelberg, Germany
[3] Sungkyunkwan Univ, Sch Med, Seoul, South Korea
[4] Kyushu Univ, Fac Med Sci, Fukuoka 812, Japan
[5] Inst Mexicano Seguro Social, Mexico City, DF, Mexico
[6] Louisiana State Univ, Hlth Sci Ctr, New Orleans, LA USA
[7] Univ N Carolina, Chapel Hill, NC USA
[8] Aichi Canc Ctr Hosp, Nagoya, Aichi 464, Japan
[9] M Sklodowska Curie Mem Canc Ctr, Warsaw, Poland
[10] Inst Oncol, Warsaw, Poland