[1] Hosp Gen Agudos, Buenos Aires, DF, Argentina
[2] Hosp Britan, Buenos Aires, DF, Argentina
[3] Sanatorio Mitre, Buenos Aires, DF, Argentina
[4] Ctr Med Corrientes, Buenos Aires, DF, Argentina
[5] CEMIC, Buenos Aires, DF, Argentina
[6] Hosp Pena Bahia Blanca, Buenos Aires, DF, Argentina
[7] Hosp Privado Cordova, Cordova, Argentina
[8] Univ Texas, MD Anderson Canc Ctr, Houston, TX 77030 USA
[9] Fundaleu, Buenos Aires, DF, Argentina