WINSTON-SALEM, N.C.--(BUSINESS WIRE)--Piedmont Medical Group (PMG), a leader in the clinical research industry with an experienced Integrated Site Network (ISN) of clinical research facilities, and ICON Clinical Research, a division of ICON plc, today announced an agreement that formalizes the working relationship between the two companies. PMG will provide ICON with feasibility intelligence and access to quality driven investigator sites that are coordinated centrally.