How to do literature search - Fukushima Medical …literature search Vo Tuan Khoa Epidemiological...
Transcript of How to do literature search - Fukushima Medical …literature search Vo Tuan Khoa Epidemiological...
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How to do literature search
Vo Tuan Khoa
Epidemiological Research Training Course VI-1
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What is practice of EBM?1. Develop a focused clinical question2. Search for the best evidence3. Critically appraise the evidence4. Apply the evidence and evaluate the outcome
The electronic databases
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www.pubmed.com
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Pubmed database• Developed by National Center for Biotechnology
Information (NCBI) at National Library of Medicine (NLM)
• Included MedLine, Old MedLine (1951 to 1965), some non-MedLine journals; published before selection for MedLine indexing, and ‘selectively indexed’ MedLine
• Search engine: receive a search request compare it with an index return the corresponding results.
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A search strategyDevelop clinical question
Identify key concept(s)
Connect concept(s) by boolean logic
Run the seach in PubMed
Limits to search5
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How questions influences the search results?
6Robin Featherstone. How to Conduct a Systematic Search in PubMedhttp://www.slideshare.net/featherr/how-to-conduct-a-systematic-search-in-pubmed
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Possible questionBroad• What is the prevalence of sexual disorders in
diabetes?Narrow• What is the risk of pancreas cancer for type 2
diabetes patients treated with DDP-IV inhibitors?Too narrow• What is the rate of unintended pregnancy for
working women in HCM City between 2000 and 2010?
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Key concept• Medical term: high blood pressure
hypertension• Acronym: MEN Multiple Endocrine
Neoplasm• Variant: tumor or tumour• PICO format• MeSH (Medical Subject Headings) tools
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Develop a PICO format
• Population/patients
• Intervention/exposure
• Comparison
• Outcome/endpoint
• Type 2 diabetes
• DPP-IV inhibitors
• (none)
• Pancreas cancer
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Identify MeSH for concept(s)What is the MeSH for these concepts?• Type 2 diabetes• Dipeptyl-Peptidase IV inhibitors or incretin?• Pancreas cancer or pancreatic cancer?
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• On PubMed screen, select MeSH Database link
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Boolean operators
A AND B A OR B A NOT B
For PubMed search:• Boolean connectors in a left-to-right sequence • Must be entered in upper case
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Limits to search• Publication date: the last 5 years• Types of article: clinical trial, meta-analysis,
systematic review• Language: english• Species: human• Sex: specify• Age: children or adult• Field tags: title
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Clinical scenario• A 60 year-old female had type 2 diabetes for
two years. She was treated with metformin and pioglitazone.
• Recently, she heard that pioglitazone treatment is associated with (hip) fracture
• What do you do?
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How to run a search in PubMed• Clinical queries• MeSH tools• PICO tools
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How to use Clinical Queries
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1. www.pubmed.com, click on Clinical Queries link2. Type key words on search engine
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Results
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How to use MeSH tools
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Setting MeSH-1 and boolean logic1. www.pubmed.com, click on MeSH link2. type key words on box search
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Setting MeSH-2 and boolean logic
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Setting MeSH-3 and Boolean logic
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Select Search Pubmed of menuPubmed search builder
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Primary results
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How to use PICO tools
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Setting PICO• P: type 2 diabetes• I: pioglitazone or thiazolidindione• C: none• O: fracture
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Log on to: http://pubmedhh.nlm.nih.gov/nlm/picostudy/
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Click on one of two links
PICO A PICO B
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Type key words
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Results
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Summary
• Searching literature is very important• 3 methods
– MeSH tool academic users– Clinical queries busy users– PICO advanced users
• Do practice…practice again…practice more and more
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