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Prevention, diagnosis and treatment of necrosing enterocolitis in newborns less than 32 weeks at birth in Spain Carlos Zozaya, Alejandro Avila-Alvarez, Iván Somoza Argibay, Fermín García-Muñoz Rodrigo, Niki Oikonomopoulou, José Luis Encinas, Miguel Saenz de Pipaón, María Luz Couce