1. University of Bristol; Neonatal Intensive Care Unit; Southmead Hospital Bristol UK BS10 5NB
2. University of Bristol Medical School; Neonatal Medicine; Southmead Hospital Bristol UK BS10 5NB
3. University of Texas Southwestern at Dallas; Division of Neonatal-Perinatal Medicine; 5323 Harry Hines Boulevard Dallas Texas USA 75390-9063
4. Southampton General Hospital; Department of Child Health; Mailpoint 21, Department of Child Health Southampton General Hospital, Tremona Road Southampton UK SO16 6YD