In a transaction valued at more than $17.6 billion, IMS Health Holdings, Inc. and Quintiles Transnational Holdings Inc. have entered a definitive merger agreement under which the combined companies will be named Quintiles IMS Holdings, Inc. Upon completion of the merger, IMS Health shareholders will own approximately 51.4% of the shares of the combined company and Quintiles shareholders will own approximately 48.6%.   The combined entity aims to improve clinical trial design, recruitment and e...