Searching the Literature: Concepts, Resources & Searching Skills
Searching the literature_Thawani
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Biomedical information retrieval using PubMed ®
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Your money!
• Lunch Money - Rs 65• Stationary - Rs 31• Certificate - Rs 04
• Total - Rs 100
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Instructions
• Use the computer as and when instructed to
• No other use of the computer is permitted during the workshop
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Learning Objectives
By the end of this session, you should be able to:
• Understand how PubMed translates basic searches.
• Use MeSH and Limits to refine your search.
• Understand and use Boolean operators.
• Develop a search strategy.
• Download and email citations
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You have to search a thesis topic on types of drug and diet therapy for skin cancer
Search the web to see what has been already done on this topic
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Information Overload
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Try PubMed ®
Looking at all the wrong places Retrieval of core information
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How do I access PubMed?
Directly at: http://pubmed.com
Or, National Library of Medicine’s homepage: http://www.nlm.nih.gov
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Copyright ©2006 AlphaMed Press
Vincent, B. et al. Oncologist 2006;11:243-251
Figure 1. Illustration of how information is stored in the MEDLINE database
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Try PubMed
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Avoid Stopwords
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Superfluous words
typesofandfor
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What is a Search Strategy?
– A plan that helps you look for the information you need. • Search Strategy Tips
– Pick a search topic– Divide topic into concepts – Find words (keywords) or subject headings (MeSH) to
represent these concepts – Refine your search to dates, study groups, etc., as
appropriate. (Limits)– Combine concepts with Boolean (AND, OR, or NOT)
connectors
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Types of drug and diet therapy for skin cancer
Patient population (Not defined)Intervention/therapy (Drug & Diet therapy)Comparison (Not applicable), and Outcome (Skin cancer)
• Find out the MeSH word for ‘Skin Cancer’
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What is MeSH?
• MeSH – Medical Subject Headings• Controlled vocabulary terms
» Epistaxis, Brain Edema, Otitis Media, Myocardial Infarction
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Click MeSH Database12:14 AM
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Select Limits
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Click to apply limits.Search
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Results are reducedfrom 4,224 to 64
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Click Display Settings
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Select Abstract and click Apply
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Selected results can also be sent to a clipboard area. Select Send to Clipboard from the dropdown menu.
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Building Blocks(Boolean Operators)
Always use in UPPERCASE12:14 AM
AND narrowsOR broadensNOT excludes
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Copyright ©2006 AlphaMed Press
Vincent, B. et al. Oncologist 2006;11:243-251
Using the Boolean operator AND between search terms returns only records that contain all of the search terms
22,18770 2,790502,02152
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Copyright ©2006 AlphaMed Press
Vincent, B. et al. Oncologist 2006;11:243-251
Using the Boolean operator OR between search terms returns all records that contain any of the search terms
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Copyright ©2006 AlphaMed Press
Vincent, B. et al. Oncologist 2006;11:243-251
Using the Boolean operator NOT between search terms returns only records that contain the first search term and not the second
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Default Functions of PubMed
• If no boolean between words, it assumes ‘AND’salmonella hamburger = salmonella AND
hamburger• If anything is written in WORD Alphabet (s) form, it assumes author gupta p shah d• If journal name or pubmed version is typed, it searches it only in
the journal gupta p shah d lancet
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Exercise 1
Impact of daily vs weekly supplementation of iron and folic acid on hemoglobin status
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Impact of daily vs weekly supplementation of iron and folic acid on hemoglobin status
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Exercise 2
• Use MeSH Database to build a strategy that will find citations to articles about Statistics of Measles Outbreak.
• Measles and Outbreak should be the major topics of the articles.
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Exercise 3
Your supervisor asks you to find an article he read in JAMA or New England Journal of Medicine about “Virtual colonoscopy” written by Mitka M.
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Exercise 4
• Find citations to articles about the ethics of kidney transplantation.
• Filter to review articles. • Select 5 items and add them to the Clipboard.• Go to the Clipboard and view the selected
items in Abstract format and email the citations to your account.
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Where PubMed lacks?
Local, cultural scientific research Non-indexed journals
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Practice makes a man perfect