[1] ALIADA Canc Ctr, Lima, Peru
[2] Luis Carlos Sarmiento Angulo Canc Treatment & Res, Bogota, Colombia
[3] Inst Nacl Cancerol, Mexico City, DF, Mexico
[4] Mem Canc Inst, Hollywood, FL USA
[5] Hosp Clin Barcelona, Barcelona, Spain
[6] CIMCA, San Jose, Costa Rica
[7] Hosp Vivian Pellas, Managua, Nicaragua
[8] Alexander Fleming Inst, Buenos Aires, DF, Argentina
[9] Fdn FICMAC, Bogota, Colombia
[10] AC Camargo Canc Ctr, Sao Paulo, Brazil