@Override
 public String execute() throws Exception {
   this.medicalHistoriesList = MedicalHistoryDao.getMedicalHistoriesList();
   for (MedicalHistory medicalHistory : medicalHistoriesList) {
     Client client = ClientDao.getClientById(medicalHistory.getClientId());
     medicalHistory.setClientFullname(client.getFullname());
   }
   return Action.SUCCESS;
 }