A technique for distributing receiver membership reports containing receiver information for a plurality of multicast source systems in a multicast source notification of interest protocol is disclosed. The methods include identifying potential aberrant DREZ using a combination of mapping techniques based on the location of the patients perceived pain, analysis of the spontaneous electrical hyperactivity in targeted DREZ, and analysis of evoked transcutaneous C-fiber stimulation both in pre-operative and operative conditions. The division bar includes upper and lower division bars which are separately arranged and respectively guide the flange portion so that a part of the teeth is exposed between the upper and lower division bars.