WOONSOCKET, R.I., and OAK BROOK, Ill. — CVS Caremark's retail-based clinic operator, MinuteClinic, has entered into a clinical affiliation with Advocate Health Care and Advocate Physician Partners to enhance the healthcare services provided to patients in communities throughout Chicagoland and central Illinois. The deal marks the largest clinical collaboration between a regional health system and MinuteClinic based on number of in-store clinic locations.