1. Neonatal Intensive Care Unit. Puerta del Mar University Hospital, Cádiz. Spain;
2. Department of Maternal and Child Health and Radiology. School of Medicine. University of Cádiz, Spain;
3. Department of Pediatrics. Puerta del Mar University Hospital, Cádiz. Spain;
4. Microbiology Laboratory. Puerta del Mar University Hospital, Cádiz. Spain.