Supress Result 0

I have the following code to SUM based on one field but want to be able
to not show rows which result is 0.
========================
SELECT Headers.employee_id AS Employee#,
SUM(CASE Headers.scan_type WHEN 'I' THEN 1 ELSE 0 END) AS SIP,
SUM(CASE Headers.scan_type WHEN 'F' THEN 1 ELSE 0 END) AS PUP,
SUM(CASE Headers.scan_type WHEN 'Q' THEN 1 ELSE 0 END) AS CMT,
SUM(CASE Headers.scan_type WHEN 'M' THEN 1 ELSE 0 END) AS CONS,
SUM(CASE Headers.scan_type WHEN '' THEN 1 ELSE 0 END) AS HIP,
SUM(CASE Headers.scan_type WHEN 'U' THEN 1 ELSE 0 END) AS HOP,
SUM(CASE Headers.scan_type WHEN '^' THEN 1 ELSE 0 END) AS INSTA,
SUM(CASE Headers.scan_type WHEN 'L' THEN 1 ELSE 0 END) AS ONRD,
SUM(CASE Headers.scan_type WHEN 'B' THEN 1 ELSE 0 END) AS POD,
SUM(CASE Headers.scan_type WHEN 'G' THEN 1 ELSE 0 END) AS PUX,
SUM(CASE Headers.scan_type WHEN '#' THEN 1 ELSE 0 END) AS ROP,
SUM(CASE Headers.scan_type WHEN 'J' THEN 1 ELSE 0 END) AS SOP,
SUM(CASE Headers.scan_type WHEN 'N' THEN 1 ELSE 0 END) AS STAT,
SUM(CASE Headers.scan_type WHEN 'R' THEN 1 ELSE 0 END) AS UNCON,
SUM(CASE Headers.scan_type WHEN '<' THEN 1 ELSE 0 END) AS
USPS_PSP,
SUM(CASE Headers.scan_type WHEN '"' THEN 1 ELSE 0 END) AS RIP,
COUNT (Scans.header_index) AS EmpTot
FROM Headers INNER JOIN
Scans ON Headers.header_index = Scans.header_index
WHERE (Scans.datetime BETWEEN '06/18/2003 00:00:00' AND
'06/19/2003 23:59:00')
GROUP BY Headers.employee_id
ORDER BY Headers.employee_id
===============================

Any ideas?
Thanks,
Manuel

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