美国HLTH Corporation
HLTH Corporation, formerly known as Emdeon Corporation, is a publicly traded company (Nasdaq: HLTH). HLTH Corporation businesses are comprised of:

WebMD, (Nasdaq: WBMD) is a publicly traded subsidiary of HLTH Corporation. WebMD is the leading provider of health information services for consumers, physicians, healthcare professionals, employers and health plans through its public and private online portals and health–focused publications. HLTH Corporation owns approximately 84% WebMD.
Porex is a developer, manufacturer and distributor of proprietary porous plastic products and components used in healthcare, industrial and consumer applications. HLTH Corporation owns 100% of Porex.