Systematic reviews differ from other types of review in that they adhere to a strict design in order to make them more comprehensive, thus minimizing the chance of bias, and ensuring their reliability. Rather than reflecting the views of the authors, or being based on a partial selection of the literature, (as is the case with many articles and reviews that are not explicitly systematic), they contain all known references to trials on a particular intervention and a comprehensive summary of the available evidence.

Epocrates is designed to provide clinical information at the point of care. Contains practical, peer-reviewed content with a unique patient-centered approach for access to continually updated integrated drug and disease information Premium features include pill identifier, alternative medicines, and a robust suite of calculators.

The HealthSTAR database contains citations to the published literature on health services, technology, administration and research. In addition to journal article citations and abstracts, HealthSTAR includes citations to meeting abstracts, technical reports and monographs

MD Consult provides access to over 36 medical texts, articles from more than 46 clinical journals, practice guidelines, drug information, 2,500 patient education handouts, CME, and daily medical updates

The premier medical literature search system, which includes Index Medicus, the International Nursing Index and the Index to Dental Literature.

The National Guideline Clearinghouse? (NGC) is a comprehensive database of evidence-based clinical practice guidelines and related documents.

An NCI database that contains the latest information about cancer treatment, screening, prevention, genetics, supportive care, and complementary and alternative medicine, plus clinical trials.

PubMed Central (PMC) is the U.S. National Library of Medicine digital archive of life sciences journal literature.

ISI Web of Knowledge is a Web portal the ISI Citation databases through Web of Science: Science Citation Index and Social Science Citation Index, as well as Current Contents and Journal Citation Reports.

Full text and summaries of Evidence Reports indexed by the Agency for Healthcare Research and Quality. Covers all aspects of healthcare and medicine.

Provides information on more than 7,800 graduate medical education programs accredited by the Accreditation Council for Graduate Medical Education (ACGME), and other related materials.

Annual Reviews volumes, published each year in approximately 30 focused disciplines within the biological, medical, physical, and social sciences, are thorough and timely collections of critical reviews written by leading scientists and academicians.

BioMed Central is an independent publishing house providing immediate free access to peer-reviewed biomedical research. BioMed Central's portfolio of over 100 journals ranges from the general interest to a range of specialist online only journals.

A searchable collection of electronic textbooks, drug reference and handbooks with a primary care focus.

Full text access to Health Sciences and Social Sciences titles from Cambridge University press.

Systematic reviews differ from other types of review in that they adhere to a strict design in order to make them more comprehensive, thus minimizing the chance of bias, and ensuring their reliability. Rather than reflecting the views of the authors, or being based on a partial selection of the literature, (as is the case with many articles and reviews that are not explicitly systematic), they contain all known references to trials on a particular intervention and a comprehensive summary of the available evidence.

The Cochrane Methodology Register is a bibliography of publications which report on methods used in the conduct of controlled trials. It includes journal articles, books and conference proceedings; these articles are taken from the MEDLINE database and from hand searches. The database contains studies of methods used in reviews and more general methodological studies which could be relevant to anyone preparing systematic reviews. CMR records contain the title of the article, information on where it was published (bibliographic details) and, in some cases, a summary of the article. They do not contain the full text of the article. The CMR is produced by the UK Cochrane Centre, on behalf of the Cochrane Methodology Review Group

A database of federally funded biomedical research projects conducted at universities, hospitals and other research institutions.

Diagnosaurus provides differential diagnoses (DDx) of symptoms, signs, and diseases.

A clinical reference tool with clinically-organized summaries for nearly 2,000 topics in evidence-based medicine.

A Bibliographic Database on Bioethics and Professional Ethics.

a database of sample medical exam questions for USMLE and Medical Specialty Board exams. The content outlines and question types conform to a large extent with the guidelines set up by the various licensing/certification authorities such as the National Board of Medical Examiners.

an online research service that highlights and reviews the most interesting papers published in the biological sciences, based on the recommendations of a faculty of well over 2300 selected leading researchers ("Faculty Members")

Google Scholar enables you to search specifically for scholarly literature, including peer-reviewed papers, theses, books, preprints, abstracts and technical reports from all broad areas of research.

Provides information on measurement instruments (tests, questionnaires, etc.)

Archive of experimentally determined 3-D structures of HIV and SIV Proteases from Protein Data Bank (PDB).

Provides comprehensive data on mitochondrial and human nuclear encoded proteins involved in mitochondrial biogenesis and function.

Interdisciplinary collection of journals in the arts, humanities, and social sciences.

A journal archive covering Health & General Sciences and Biological Sciences

Detailed protocols and descriptions of biochemical and biophysical techniques. Access from volume 1 (1955) to the present

Natural Standard is an international research collaboration that aggregates and synthesizes data on complementary and alternative therapies.

The National Health Service (NHS) Economic Evaluation Database is funded by the Department of Health's NHS Research and Development Programme, and produced by the Centre for Reviews and Dissemination (CRD), and provides cost-benefit analyses about healthcare interventions. The NHS Economic Evaluation Database contains over 6000 abstracts of quality assessed economic evaluations. The database aims to assist decision-makers by systematically identifying and describing economic evaluations, appraising their quality and highlighting their relative strengths and weaknesses.

Population Index is the primary reference tool to access the world's population literature. It presents an annotated bibliography of recently published books, journal articles, working papers, and other materials on population topics.

With more than 1.5 million entries, Proquest'sDissertation Abstracts database is the one central, authoritative source for information about doctoral dissertations and master's theses.

a full-text database of over 1100 books and chapters in the American Psychological Association?s array of electronic ebooks.

Indexes and abstracts books, dissertations and journal articles in the psychological and behavioral sciences, including the creative arts therapies.

A comprehensive science-specific search engine on the Internet. Searches open-access websites as well as peer-reviewed content from publisher sites.

Provides searching platform for a number of periodical databases covering the Food Sciences, Engineering and Technology, Humanities, and Social Sciences.

Abstracts and full-text from a selection of 28 English-language and 50 German-language journals in the fields of chemistry, biology and medicine.