buffer.append("\t</ul>\r\n");
buffer.append("\t</ul></li>\r\n");
    private void getInstitutionSubUnitsTree(StringBuilder buffer, Unit parentUnit,	    List<Unit> activeSubUnits, YearMonthDay currentDate) {	if (!activeSubUnits.isEmpty()) {	    buffer.append("\t<ul class='mvert0' id='aa").append(parentUnit.getIdInternal()).append(		    "' style='display:none'>\r\n");	    for (Unit subUnit : activeSubUnits) {		getSubUnitsWithoutAggregatedUnitsList(buffer, currentDate, subUnit);	    }	    buffer.append("\t</ul>\r\n");	}    }