[1] INST MEXICANO SEGURO SOCIAL,CTR MED NACL,DIV INMUNOQUIM UNIDAD INVEST BIOMED,MEXICO CITY 06500,DF,MEXICO
[2] HOSP INFANTIL MEXICO FEDERICO GOMEZ,INMUNOPARASITOL LAB,MEXICO CITY,DF,MEXICO
[3] NATL AUTONOMOUS UNIV MEXICO,INST QUIM,MEXICO CITY 20,DF,MEXICO