Method and system for providing continuous calibration of analyte sensors includes calibrating a first sensor, receiving data associated with detected analyte levels from the first sensor, and calibrating a second sensor based on a predetermined scaling factor and data associated with detected analyte levels from the first sensor, is disclosed. In one embodiment, the invention describes a method of forming a through substrate via by partially filling an opening with a fill material, and forming a first insulating layer over the first fill material thereby forming a gap over the opening. The second base member is urged by an elastic force of a first elastic member, provided on at least one connecting portion, to move forwardly with respect to the first base member. The winding spring has an outer diameter smaller than the inner diameter of the spring receptacle section. The information provided to the user terminals allows users at the user terminals to more easily select sorted IRC services.