Effect of autologous umbilical cord blood transfusion in the development of retinopathy of prematurity: randomized clinical trial – study protocol oleh Laura Torrejon-Rodriguez, Alejandro Pinilla-Gonzalez, Inmaculada Lara Cantón, Abel Albiach-Delgado, Mari Merce Cascant-Vilaplana, María Cernada, Julia Kuligowski, Maria Pilar Solves Alcaina, Inés Gómez, Maximo Vento, Marta Aguar Carrascosa