1. Cumulative risk over the early life course and its relation to academic achievement in childhood and early adolescence Ragnarsdottir, Laufey Dís; Kristjansson, Alfgeir L.; Thorisdottir, Ingibjorg E.; Allegrante, John P.; Valdimarsdottir, Heiddis; Gestsdottir, Steinunn; Sigfusdottir, Inga Dora 2020 Articles Academic achievementChild developmentChildren--Family relationshipsChildren--Health and hygieneRisk