Efficiënt en systematisch zoeken in bibliografische databanken

Efficiënt en systematisch
zoeken in bibliografische
databanken
Donderdag 9 Maart
VOGIN-IP lezing 2017

Medische Bibliotheek Erasmus MC
food breast cancer management
Hoeveel hits verwacht je?
0
5
100
500
1.000
5.000
20.000
1.000.000

Variaties in een database
Research onderwerp:
Vitamins and hormones within the field of clinical
dermatology

Systematic approach
(vitamins[mh] OR hormones[mh] OR vitamins[pa]
OR hormones[pa] OR vitamin*[tiab] OR
hormon*[tiab]) AND ("Clinical Study" [pt] OR
clinical medicine[mh] OR Clinical Studies as
Topic[mh] OR clinical*[tiab] ) AND
(dermatology[mh] OR dermatol*[tiab] OR skin
diseases[mh] OR skin disease*[tiab])

term* OR longterm*) NEAR/3 (pain*)) OR (loss NEAR/3 function*) OR
(burn NEAR/3 outcome* NEAR/6 questionnaire*) OR boq OR ((burn OR
burns) NEAR/6 health NEAR/3 scale*) OR bshs OR euroqol OR sf36 OR
sf-36 OR short-form-36 OR eq-5d OR eq-6d OR eq5d OR eq6d OR itqol
OR (physical* NEAR/3 (activ* OR perform*)) OR (independent* NEAR/3
living) OR (social* NEAR/3 participat*)):ab,ti) AND ('cohort analysis'/exp
OR 'longitudinal study'/exp OR 'retrospective study'/exp OR 'prospective
study'/exp OR 'validation study'/exp OR 'validity'/exp OR 'sensitivity and
specificity'/exp OR 'clinical article'/de OR 'observational study'/de OR
'major clinical study'/de OR 'follow up'/de OR 'epidemiological data'/de OR
'case control study'/exp OR 'cross-sectional study'/exp OR (cohort* OR
longitudinal* OR retrospectiv* OR prospectiv* OR validat* OR validit* OR
(observation* NEAR/3 stud*) OR sensitiv* OR specific* OR 'follow* up*'
OR followup* OR epidemiolog* OR 'case control*' OR 'cross-
section*'):ab,ti) NOT ([animals]/lim NOT [humans]/lim)

Medische Bibliotheek Erasmus MC 33
Wie zijn wij / wat doen wij?
Wichor Bramer | Gerdien de Jonge
Informatiespecialisten Medische Bibliotheek – Erasmus MC Rotterdam
w.bramer@erasmusmc.nl | @wichor | nl.linkedin.com/in/wichor
>300 systematische searches per jaar
>25 co-auteurschappen van reviews (link)
PhD: Efficiency in librarian-mediated searches for systematic reviews

Tijd nodig voor zoekactie systematic review
Bramer WM, Rethlefsen ML, Mast F, Kleijnen J. A pragmatic evaluation of a new method for librarian-mediated
literature searches for systematic reviews. submitted. 2017.

Wie zijn jullie?
Vakgebied (biomedisch / anders)
Zoekacties (waarvoor / hoeveel / hoe)
Databases / interfaces (pubmed / embase / ovid / ebsco /
discoverytools / google (scholar) )
Thesaurus ?

Research question  exhaustive search
Systematic searching
1. Examining the research question
2. Identifying key terms
a. Thesaurus terms
b. Free text terms
3. Creating a basic search strategy
4. Optimizing the basic strategy
5. Translating the strategy between databases

The Research Question
Clear and focused

Medische Bibliotheek Erasmus MC 38
Clear and focused research question
How can gist knowledge of patients be measured
Is scopic stabilisation better than Bristow Latarjet for
treating an Anterior glenohumeral luxation with labrum
injury (no ossale disorder) in a 20 YO rugby player for
recurrent luxation or other Patient Related Outcome
Measures
Dietary intake and cardiovascular disease
TOO VAGUE
TOO SPECIFIC
TOO BROAD

Clear and focused
Which articles can answer the question?

Facilitators and barriers in preconception care
 evaluation studies of preconception care
Predictive factors for oronasal fistulas in children treated for clef lip
 follow up studies of children treated for clef lip

Clear and focused
Understanding the research question?

Do you need to fully understand the research
question?
What is the Cell contribution to chondroid /
endochondreal / intramembranous bone formation
((('bone development'/de OR 'bone mineralization'/de OR 'bone
maturation'/de OR ossification/de OR 'bone conduction'/de OR 'bone
transplantation'/exp OR 'bone matrix'/exp OR 'bone growth'/exp OR
'bone remodeling'/de OR ((bone NEAR/6 (minerali* OR develop* OR
format* OR synthesis* OR growth* OR graft* OR transplant* OR
engineer* OR defect* OR matri* OR remodel* OR conduct* OR
maturat*)) OR osteogen* OR ossificat*):ab,ti) AND (chondroid* OR
transchondroid* OR enchondr* OR endochondr* OR intermembran*
OR cartilagin* OR (inter NEXT/1 membran*)):ab,ti) OR 'enchondral
ossification'/de) AND ('cell death'/de OR 'cell survival'/de OR
apoptosis/de OR 'cell differentiation'/de OR 'cell fate'/de OR 'host
cell'/de OR 'cell lineage'/de OR (((cell* OR msc OR osteoblast* OR
osteocyte* OR osteoclast* OR preosteoblast*) NEAR/3 (death OR
senescen* OR contribut* OR differentiat* OR fate OR plasticit* OR
reprogram* OR donor* OR host* OR recruit* OR surviv* OR viabilit*
OR lineage*)) OR apoptosis):ab,ti)

Clear and focused
Understanding the research question?
Elements (Key Concepts):
- Watch our for Bias and Duplicates
- Which elements to use in search?

Elements : Bias
Very specific characteristics
Duration of breastfeeding and intelligence
Judgements
Poor family functioning, harsh parenting and bullying behavior

Elements : Duplicates
Pre-eclampsia AND pregnant AND women
Lichtenstein therapy AND inguinal hernias

Does eating broccoli help in the prevention of cancer
generalspecific
important
unimportant
Broccoli Cancer
Prevention
Broccoli CancerPrevention

Identifying search terms
Thesaurus

Identifying free text words
Optimal sensitivity only by additionally searching in title / abstract:
 Relevant, non-inverted terms from synonyms/ entry terms

 Relevant, non-inverted terms from synonyms / entry terms
Shoulder: glenohumeral joint- humeroscapular joint-
scapulo humeral joint- scapulohumeral joint- articulatio
humeri
 Relevant words / phrases from narrower terms

 Relevant, non-inverted terms from synonyms / entry terms
Shoulder: glenohumeral joint- humeroscapular joint-
scapulo humeral joint- scapulohumeral joint- articulatio
humeri
 Relevant words / phrases from narrower terms
Colorectal Neoplasms: Colonic cancer- Cancer of
Sigmoid- Rectum tumor- Anal Neoplasms…etc…

Creating a basic search strategy
DEMO

Creating a basic search strategy (summary)
 Type code in Word
 Open an element with ()
 For emtree terms type ''/exp and paste term
 After pasting all emtree terms, type OR ():ab,ti within that element once
for free text words
 Type single word synonyms first
 Type (() NEAR/3 ()) somewhere in the document to reuse
 Copy (() NEAR/3 ()) into the ():ab,ti part search for phrase variants, and
add the words

Optimizing your strategy
Sort by relevance and check title / abstract and thesaurus
Add new relevant words to the search in Word
Temporarily change the syntax and check words:
Per element, keeping the rest unchanged
 (thesaurus) NOT (free text)
 (free text) NOT (thesaurus)
DEMO

Considerations
Explode a broad term or not?
Start exploded, when many irrelevant results appear, be
more specific
Truncate a term or not?
Truncate as much as possible, hardly noise
Phrases or proximity?
Always proximity, easier and more sensitive
How broad should proximity be?
Start with 3, increase with 3 and
evaluate newly retrieved articles

Vertalen van zoekacties tussen databases
Embase.com (Embase and Medline) -1
Thorough optimization of thesaurus terms and title / abstract terms in search strategy
Macro and edit thesaurus
Medline (Ovid incl ePub) -2
MeSH terms in PubMed / Optimization
Add extra terms Remove thesaurus
Cochrane library -3
Macro
Web-of-science -4
Macro
Scopus
Macro and edit
thesaurus
CINAHL (EBSCO)
edit
thesaurus
PsycINFO
(OvidSP)
Macro and edit
Google Scholar -5
Liliacs / Scielo / Popline /
Trials Registers / WorldCat
Basic search strategy with
AND, OR parentheses based
on basic Google terms
DEMO

Success factors
 Optimization techniques
 Macros for database translation
 Single-line search strategies
 Database choice and order
 Direct feedback by researcher
 Creating queries in Word
 Computer literaracy
 Experience (be pro active)

Effect voor de organisatie

Efficiënt en systematisch zoeken in bibliografische databanken

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