Hemoglobin Blood 5 Glycated hemoglobin (HbA1c) 3 Glycated hemoglobins 3 Machine learning 3 Photoplethysmography 3 machine learning 3 Blood glucose 2 Blood glucose level 2 Feature 2 Food intake 2 Glucose 2 Glucose control 2 HbA1c 2 Hba1c 2 In-vivo 2 Learning algorithms 2 Machine-learning 2 Risk assessment 2 diabetes 2 features 2 photoplethysmography 2 Absorption spectroscopy 1 Anemia 1 Antibiotics 1 Application programs 1 Article 1 Biocompatibility 1 Blood samples 1 Cell death 1