Exhibit 3.28(a)

STATE OF DELAWARE

SECRETARY OF STATE

DIVISION OF CORPORATIONS

FILED 03:45 PM 04/19/2002

020252570 – 3516531

CERTIFICATE OF FORMATION

OF

MICHIGAN PHARMACEUTICAL SERVICES, LLC

The undersigned natural person of the age of eighteen (18) years or more, being an authorized person under the Delaware Limited Liability Company Act, hereby executes this Certificate of Formation.

1.             NAME.   The name of the limited liability company is Michigan Pharmaceutical Services, LLC.

2.             REGISTERED OFFICE.   The address of the limited liability company’s registered office is 1209 Orange Street, Wilmington, Delaware 19801.

3.             REGISTERED AGENT.   The name and address of the limited liability company’s registered agent is The Corporation Trust Company, 1209 Orange Street, Wilmington, Delaware 19801.

IN WITNESS WHEREOF, the undersigned has executed this Certificate of Formation of Michigan Pharmaceutical Services, LLC this 19 day of April, 2002.

By:	/s/ Phillip H. Watts
	Phillip H. Watts
	Authorized Person