/** @return Returns the investigators. */
 public List getInvestigators() {
   if (investigators == null || refresh == true) {
     investigators = investigatorDAO.getInvestigators();
     refresh = false;
   }
   return investigators;
 }
 public void saveInvestigator(Investigator stock) throws Exception {
   investigatorDAO.saveInvestigator(stock);
   refresh = true;
 }
 /** For Investigator */
 public Investigator getInvestigator(Integer InvestigatorID) {
   return investigatorDAO.getInvestigator(InvestigatorID);
 }