Improved neonatal care has resulted in increased survival rates among infants born after only 22 gestational weeks, but extremely preterm children still have an increased risk of neurodevelopmental delays, learning disabilities and reduced cognitive capacity, particularly executive function deficits. | Stockholm preterm interaction-based intervention (SPIBI) - study protocol for an RCT of a 12-month parallel-group postdischarge program for extremely preterm infants and their parents