References
Pulse oximetry for the assessment of autonomic neuropathy in diabetic patients. https://www.ncbi.nlm.nih.gov/pubmed/9025011 Increased blood glycohemoglobin A1c levels lead to overestimation of arterial oxygen saturation by pulse oximetry in patients with type 2 diabetes. https://www.ncbi.nlm.nih.gov/pubmed/22985301 Non-invasive blood glucose monitoring using near-infrared spectroscopy https://www.edn.com/design/medical/4422840/Non-invasive-blood-glucose-monitoring-using-near-infrared-spectroscopy