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