During a surgical procedure, {HEAD ~ neutral electrode} 10 is attached to the patient 15 in {TAIL ~ the usual manner}  
During a surgical procedure , { HEAD ~ neutral electrode } 10 is attached to the patient 15 in { TAIL ~ the usual manner }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH