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