PROVANTAGE HEALTH SERVICES INC

Beneficial ownership report for a passive holder of more than 5% (Schedule 13G) (amendment)

Certification of termination of registration of a class of securities (Section 12(b))

Tender offer statement by a third party (amendment)

General form for quarterly reports under Section 13 or 15(d)

No description available

Tender offer statement by a third party (amendment)

Tender offer statement by a third party (amendment)

No description available

Beneficial ownership report for a holder of more than 5% (Schedule 13D)

Tender offer statement by a third party

No description available

No description available

Tender offer statement by a third party

No description available

Annual report pursuant to Section 13 or 15(d)

Definitive Proxy Statement

General form for quarterly reports under Section 13 or 15(d) (amendment)

Beneficial ownership report for a passive holder of more than 5% (Schedule 13G)

5,7

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Prospectus Supplement with Pricing Information

No description available

Amended Initial Registration Statement

Amended Initial Registration Statement

Amended Initial Registration Statement

Registration of Securities on Exchange

Withdrawal of a registration statement

Amended Initial Registration Statement

No description available

Registration (IPO) statement under Securities Act of 1933

MERCK & CO INC