Posterior subependymal germinal matrix hemorrhage as a mild form of hemorrhage in extremely preterm infants: neurodevelopmental outcomes at corrected ages of 18-24 months. - Koo, Jae Mo; Yoo, So-Young; Kim, Ji Hye; Park, Ji Eun; Baek, Sun-Young; Jeon, Tae Yeon (Ultrasonography, 2025)