public function getActiveAppointments($respondentId, $organizationId, $patientNr = null, $where = null)
    {
        if ($where) {
            $where = "($where) AND ";
        } else {
            $where = "";
        }
        $where .= sprintf('gap_status IN (%s)', $this->getStatusKeysActiveDbQuoted());

        return $this->getAppointments($respondentId, $organizationId, $patientNr, $where);
    }