public static function getById($id)
 {
     $sql = 'select * from donante where id = :id';
     $query = self::nuevaDb()->prepare($sql);
     $query->execute(array(":id" => $id));
     $arreglo = $query->fetchAll(PDO::FETCH_ASSOC);
     $result = Donante::inicializar($arreglo[0]);
     return $result;
 }