Defining {TAIL ~ a target group} of patients may include processing the medical records of the existing patients to determine which of the medical records define {HEAD ~ the existence} of a selected condition, such as a medical condition, physical criteria, habit, or activity of a patient 
Defining { TAIL ~ a target group } of patients may include processing the medical records of the existing patients to determine which of the medical records define { HEAD ~ the existence } of a selected condition , such as a medical condition , physical criteria , habit , or activity of a patient
OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH