[1] Emory Univ, Sch Med, Atlanta, GA USA
[2] Catholic Unvers Korea, Coll Med, Seoul St Marys Hosp, Catholic Blood & Marrow Transplantat Ctr,Dep Hema, Seoul, South Korea
[3] Univ Pavlov, St Petersburg, Russia
[4] Univ Milano Bicocca, Monza, Italy
[5] Univ Klinikum Jena, Klin Innere Med 2, Jena, Germany
[6] Hosp Nacl Edgardo Rebagliati Martins, Lima, Peru
[7] Univ Maryland, Sch Med, Greenebaum Canc Ctr, Baltimore, MD 21201 USA
[8] Hosp Clin FMUSP, Sao Paulo, Brazil
[9] Univ Sao Paulo, Childrens Inst, Sao Paulo, Brazil
[10] Pfizer Inc, Cambridge, MA USA
[11] Wyeth Res, Paris, France
[12] Univ Texas MD Anderson Canc Ctr, Houston, TX 77030 USA