- There are major ethical issues It is essential, therefore, to recruit children from various regions in France in order to obtain a critical sample size of sufficient magnitude and to conduct scientific sound studies. This will be achieved by performing Pharm A, a population pharmacokinetic study of three different anti infectious agents (ceftazidime, ciprofloxacin, voriconazole) and identify covariates including pharmacogenetic biomarkers that explain pharmacokinetic variability.