Study population: Patients on CIPII. Intervention: There are 3 study phases. In the Baseline phase, all patients will have the RT-CGMS blinded so that no information on blood glucose values measured and stored by the RT-CGMS will be available to care-givers, investigators or patients during this study period. Randomization will determine the sequence of blinded and unblinded RT-CGMS in the 2nd and 3rd phase. When the RT-CGMS is not blinded, the system will alert whenever a glucose level falls below or rises above preset values. Sensor values are not intended to be used directly for making therapy adjustments. Whenever a value is below or above the preset value, the blood glucose level will be measured using a blood glucose meter and therapy adjustments based on this value will be done according to protocol.