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Dialog Adds Exclusive Health, Disease Statistics to Medical Information Collection

CARY, NC, USA (October 31, 2003) — Dialog, a Thomson (TSX: TOC; NYSE: TOC) business and a leading worldwide provider of online-based information services and integrated information solutions, today said that it has added three files of epidemiological data to its in-depth collection of medical information available through its Dialog® online service.

Dialog is used worldwide by medical researchers, biotech and pharmaceutical companies, government healthcare agencies, insurance forecasters, medical equipment manufacturers, consultants and others to conduct research and track trends on a wide range of health-related topics.

The three new files now available exclusively through the Dialog services are Hospital Inpatient Profiles (File 462), Hospital Outpatient Profiles (File 463) and Emergency Room (File 454). Each is composed of data compiled in the United States.

The databases are provided by Timely Data Resources (www.tdrdata.com), based in Capitola, California, which also supplies Dialog with its Incidence and Prevalence database (File 465), again available exclusively through Dialog.

“We’re delighted to be working with Timely Data Resources to bolster our collection of medical information,” said Viji Krishnan, Dialog vice president of content development. “At a time when healthcare costs and disease control are major concerns in many countries, additional high-quality epidemiological data from Timely Data Resources, one of the field’s premier information providers, will be a significant benefit for our users in the medical research arena.”

Added Krishnan: “Though government-collected medical research often is in the public domain, medical researchers look to Dialog to provide well-structured and fully searchable databases that can be searched along with related information, such as pharmaceutical information and industry news. The great advantage of Dialog is the ability to conduct research on such a broad range of interconnected topics quickly and with confidence in the integrity of the information.”

The Hospital Inpatient Profiles file provides data on more than 7,000 diseases afflicting U.S. hospital inpatients. It also includes data on procedures, related illnesses, payment source, discharge status and more. The data originates from the annual National Hospital Discharge Survey, covering approximately 270,000 inpatient records from about 500 hospitals.

The Hospital Outpatient Profiles file provides data on more than 2,400 diseases inflicting outpatients surveyed as part of the annual National Hospital Ambulatory Medical Care Survey (NHAMCS), a national probability sample of hospital visits. The research is conducted by the National Center for Health Statistics, part of the U.S. federal government’s Centers for Disease Control (CDC). Information available includes drugs prescribed, diagnostics provided, visit characteristics, payment source, disposition and related data.

The Emergency Room file, also based on the CDC’s NHAMCS research, covers 2,600 diseases. Data available includes the characteristics of patients arriving in emergency rooms (such as gender, age, ethnicity breakouts, race and expected payment sources); characteristics of visits (such as urgency of care required, waiting time, level of pain or poisoning as cause, place of injury and more); and diagnostics, screening, medications and procedures provided.

The addition of the Timely Data Resources databases continues an ongoing campaign by Dialog to expand its collection of medical information, the company said.

Examples of medical information files available through Dialog services include MEDLINE®, EMBASE®, Current Contents Search®, New England Journal of Medicine, Gale Health & Wellness DatabaseSM, NewsRx Weekly Reports, Gale Newsletter Database™, and abstracts from thousands of specialty journals, many available for immediate e-linking to fulltext accessible through publisher Web sites.

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About Dialog and The Thomson Corporation
Dialog, a pioneer in developing the technology behind electronic information retrieval, is the world leader in providing online-based information services to organizations seeking competitive advantages in such fields as business, science, engineering, finance and law.

Today, the online services provided by Dialog — offered through the Dialog®, Dialog Profound®, Dialog DataStar™, Dialog NewsEdge and Intelligence Data brands — give users the ability to precisely retrieve data from more than 1.4 billion unique records, accessible via the Internet or through delivery to enterprise intranets. Searchable content includes articles and reports from thousands of real-time news feeds, newspapers, broadcast transcripts and trade publications, plus research reports and analyst notes providing support for financial decision-making, as well as in-depth repositories of scientific and technical data, patents, trademarks and other intellectual property data. Information professionals and end-users at business, professional and government organizations in more than 100 countries prize Dialog services for their depth and breadth of content, precision searching and speed.

Based in Cary, N.C., USA, Dialog has operations in 31 other countries. Dialog (www.dialog.com) is a business of The Thomson Corporation (TSX: TOC; NYSE: TOC). With 2002 revenues of US$7.8 billion, Thomson (www.thomson.com) is a global leader in providing integrated information solutions to business and professional customers.

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All designated trademarks used herein are the property of The Dialog Corporation or its subsidiaries. Registered marks are registered by The Dialog Corporation or its subsidiaries with the U.S. Patent and Trademark Office. All other marks are trademarks or registered trademarks of their respective owners.

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