A rule processing method includes defining {TAIL ~ a target group} of patients chosen from a group of {HEAD ~ existing patients} 
A rule processing method includes defining { TAIL ~ a target group } of patients chosen from a group of { HEAD ~ existing patients }
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD