function fetchParticipantMap($itemID, $sortBy, $offset, $limit, $field)
 {
     $itemParameters = array('item_id' => $itemID, 'offset' => $offset, 'limit' => $limit, 'sort_by' => $sortBy);
     if ($field !== false) {
         $itemParameters['sort_field'] = $field;
     }
     $children = eZCollaborationItemParticipantLink::fetchParticipantMap($itemParameters);
     if ($children === null) {
         $resultArray = array('error' => array('error_type' => 'kernel', 'error_code' => eZError::KERNEL_NOT_FOUND));
     } else {
         $resultArray = array('result' => $children);
     }
     return $resultArray;
 }