1. Department of Neonatology, Hospital Materno-Infantil del CHU, Granada, Spain.
2. Research Department, Biosearch Life, Granada, Spain.
3. Department of Metabolism and Pediatrics Research, Hospital Reina Sofía, Córdoba, Spain.
4. Department of Pediatrics, School of Medicine, University of Granada, Spain.
5. Department of Neonatology, Hospital G.U. Santa Lucía, Cartagena, Murcia, Spain.
6. Department of Neonatology, Hospital R.U., Málaga, Spain.
7. Department of Neonatology, Hospital C.H.U., Santiago de Compostela, La Coruña, Spain.
8. Department of Pediatrics, Hospital U., Salamanca, Spain.