Continuous glucose monitoring
All study participants inserted and wore a CGM sensor on the back of either their right or left upper arm, without any over-bandage for up to 14 days. Participants in the blinded group wore the sensor for 14 days without a reader. Neither the participant nor the study team members had access to the data recorded by the CGM sensor during this time. At the end of the 14-days the participant were to scan the sensor using the blinded-reader by themselves or there were assisted by a clinical research coordinator in the clinic, and the data from the reader was downloaded to a research computer. Participants in the unblinded group wore the sensor for 14 days with an open reader which provided them glucose readings each time the sensor was scanned. The participants were requested to upload their glucose readings every 8 hours, or at least three times a day where possible using the reader provided, but were allowed to scan their glucose levels as often as they wanted. After each 14-day wear- period all participants were asked to dispose of the used sensor and received a new sensor according to the study clinic visit schedule (Figure S1). Apart from the type of CGM sensors allocated, all participants were assessed in the same way.