A laboratory has a mobile housing, a testing apparatus, a shielding unit and a firstsecond testing set. Each of the plurality of threads includes a head side surface having a first angle relative to an axis perpendicular to the axis of the screw, and a tip side surface having a second angle relative to the axis perpendicular to the axis of the screw. The pacing method includes the sensing of ventricular depolarization and the identification of an early electrical event, such as a depolarization of the HIS bundle or an onset of a ventricular depolarization. The SNS server includes a post information DB, a map DB, and a guidance information DB.