{TAIL ~ A cardiac pacemaker}, defibrillator, or other programmable medical device includes a source unit and {HEAD ~ a collection unit}  
{ TAIL ~ A cardiac pacemaker } , defibrillator , or other programmable medical device includes a source unit and { HEAD ~ a collection unit }
TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH