public boolean afegirMalalties(String dni, List<String> malalties) {
   Boolean ok = true;
   for (String m : malalties) {
     ok = ok && controladorPacients.afegirMalaltia(dni, m);
   }
   return ok;
 }
 public static ControladorPresentacioEstudis getInstance(Main main) {
   if (objecteControladorPresentacioEstudis == null) {
     objecteControladorPresentacioEstudis = new ControladorPresentacioEstudis(main);
     controladorAlgorisme = ControladorAlgorisme.getInstance();
     controladorPacients = ControladorPacients.getInstance();
     controladorSequencies = ControladorSequencies.getInstance();
     controladorMalalties = ControladorMalaltiesSimptomes.getInstance();
     controladorPresentacioPacients = ControladorPresentacioPacients.getInstance(main);
   }
   return objecteControladorPresentacioEstudis;
 }