[1] Inst Nacl Cancerol, Thorac Oncol Unit, Mexico City, DF, Mexico
[2] Inst Nacl Cancerol, Lab Personalized Med, Mexico City, DF, Mexico
[3] Clin Country, Inst Oncol, Med Oncol Clin & Traslat Oncol Grp, Bogota, Colombia
[4] Hosp San Juan Dios, Clin Oncol Dept, San Jose, Costa Rica
[5] Hosp Oncol Luis Razetti, Caracas, Venezuela
[6] Hosp Univ San Ignacio, Ctr Javeriano Oncol, Bogota, Colombia
[7] Hosp Roberto Calderon, Oncol Dept, Managua, Nicaragua
[8] Inst Alexander Fleming, Dept Clin Oncol, Buenos Aires, DF, Argentina
[9] Udelar, Med Oncol Dept, Montevideo, Uruguay
[10] Inst Nacl Enfermedades Neoplas, Med Oncol, Lima, Peru
[11] Johns Hopkins Univ Hosp, Internal Med Dept, Baltimore, MD 21287 USA
[12] Arsuve, Med Oncol, Caracas, Venezuela
[13] Clin Prevenc Canc, Caracas, Venezuela
[14] Hosp Germans Trias I Pujol, Catalan Inst Oncol, Barcelona, Spain