Pennsylvania is set to sign a contract with a Michigan-based information technology contractor to build the backbone of the state's new health communications network, a system that will allow for the exchange of patient data among doctors, hospitals, pharmacies and insurance companies. Truven Health Analytics, based in Ann Arbor, is in line to build what's being called Pennsylvania's "community shared services" network, a platform that will allow all of the state's existing health information exchanges to communicate with each other and swap data.