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Hoecker, C; Nelle, M; Beedgen, B; Rengelshausen, J; Linderkamp, O (2006). Effects of a divided high loading dose of caffeine on circulatory variables in preterm infants. Archives of disease in childhood - fetal and neonatal edition, 91(1), F61-4. London: BMJ Publishing Group 10.1136/adc.2005.073866