/**
  * Method returns a list of all the staff members that had ever had an appointment with given patient
  *
  * @param patientId
  * @return list of staff members associated with patient
  */
 public List <IModel> getStaffMembersBasedOnPatient(int patientId)
 {
     return(repo.getStaffMembersBasedOnPatient(patientId));
 }