UMBERTO I HOSP, DEPT PEDIAT, São Paulo, BRAZILESCOLA PAULISTA MED, DEPT PEDIAT, BR-04023 São Paulo, SP, BRAZILESCOLA PAULISTA MED, DEPT MICROBIOL, BR-04023 São Paulo, SP, BRAZILESCOLA PAULISTA MED, DEPT PEDIAT, BR-04023 São Paulo, SP, BRAZILESCOLA PAULISTA MED, DEPT MICROBIOL, BR-04023 São Paulo, SP, BRAZILWeb of Scienc