1. Department of Neonatology, University Hospital of Caen, 14000 Caen, France
2. Pharmaco-Epidemiology Unit, Department of Cardiology, University Hospital of Caen, 14000 Caen, France
3. Department of Pharmacy, University Hospital of Caen, 14000 Caen, France
4. Department of Microbiology, University Hospital of Caen, 14000 Caen, France