1 Division of Neonatology Director, Newborn Nurseries, The University of Alabama at Birmingham, 700 6th Avenue South 176F Suite 9380R, Birmingham, AL 35233-7335, USA. Electronic address: wcarlo@peds.uab.edu.
2 University of Alicante, Division of Neonatology, University & Polytechnic Hospital La Fe, Neonatal Research Unit, The Health Research Institute La Fe, Bulevar Sur s/n, Valencia, Spain. Electronic address: Maximo.Vento@uv.es.