Article Blood Glucose Blood Glucose Self-Monitoring Child Continuous glucose monitoring Diabetes Mellitus, Type 1 Follow-Up Studies Glycated Hemoglobin A Glycated hemoglobin Hemoglobin glycation index Humans Kinetic modeling Red cell glucose uptake Red cell turnover Registries adolescent adult blood glucose monitoring child clinical practice controlled study diabetes mellitus diabetic patient disease registry erythrocyte lifespan female follow up glucose glucose blood level glucose transport