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Optimal search strategy for clinical trials in the Latin American and Caribbean Health Science Literature Database (LILACS)

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A ldem ar A raujo C astro, O távio A ugusto C âm ara C lark, A lvaro N agib A tallah

O p tim a l se a rc h stra te g y fo r c lin ic a i tria ls in th e L a tin

A m e ric a n a n d C a rib b e a n H e a lth S c ie n c e L ite ra tu re

D a ta b a se (L IL A C S )

Clinicai Trial and Meta-Analysis

Unit, Federal University of São Paulo, in conjunction

with the

Brazilian Cochrane Center - São Paulo, Brazil

O b je c tiv e : T o d e fin e a n d d is s e m in a te th e o p tim a l s e a rc h s tra te g y fo r c lin ic a i tria ls in th e L a tin A m e ric a n a n d C a rib b e a n H e a lth S c ie n c e L ite ra tu re (L IL A C S ). T h is s tra te g y w a s e la b o ra te d b a s e d o n th e o p tim a l s e a rc h s tra te g y fo r M E D L IN E re c o m m e n d e d b y C o c h ra n e C o lla b o ra tio n fo r th e id e n tific a tio n o f c lin ic a i tria ls in e le c tro n ic d a ta b a s e s . D e s ig n : T e c h n ic a l in fo rm a tio n . S e ttin g : C lin ic a i T ria ls a n d M e ta -A n a ly s is U n it, F e d e ra l U n iv e rs ity o f S ã o P a u lo , in c o n ju n c tio n w ith th e B ra z ilia n C o c h ra n e C e n te r, S ã o P a u lo , B ra z il. (h ttp ://w w w .e p m .b r/c o c h ra n e ). D ata.;. L IL A C S /C D -R O M (L a tin A m e ric a n a n d C a rib b e a n H e a lth S c ie n c e In fo rm a tio n D a ta b a s e ), 2 7 th e d itio n , J a n u a ry 1 9 9 7 , e d ite d b y B IR E M E (L a tin A m e ric a n a n d C a rib b e a n H e a lth S c ie n c e In fo rm a tio n C e n te r). L IL A C S In d e x e s 6 7 0 jo u rn a ls in th e re g io n , w ith a b s tra c ts in E n g lis h , P o rtu g u e s e o r S p a n is h ; o n ly 4 1 o v e rla p in th e M E D L IN E -E M B A S E . O f th e 1 6 8 .9 0 2 c ita tio n s s in c e 1 9 8 2 , 1 0 4 ,0 1 6 a re in h u m a n tria ls , a n d 3 8 ,2 6 1 c ita tio n s a re p o te n tia lity c lin ic a i tria ls . S e a rc h s tra te g y w a s e la b o ra te d c o m b in in g h e a d in g s w ith te x t w o rd in th re e la n g u a g e s , a d a p tin g th e in te rfa c e o f th e L IL A C S . W e w ill b e w o rk in g b y lo c a tin g c lin ic a i tria ls in L IL A C S fo r C o c h ra n e C o n tro lle d T ria ls D a ta b a s e . T h is e ffo rt is b e in g c o o rd in a te d b y th e B ra z ilia n C o c h ra n e C e n te r.

U N IT E R M S : C lin ic a i T ria l. M e ta -A n a ly s is . E le c tro n ic D a ta b a s e s . L o c a tio n a n d S e le c tin g s tu d ie s . In fo rm a tio n S to ra g e a n d R e trie v a l. M E D L IN E . L IL A C S .

IN T R O D U T IO N

A

s y s te m a ticn u n b ia s e d r e v ie w .s e a r c h T o p r o te e tis th e k e ya g a in s tto a r e le v a n tb ia s a n d e n s u r e th a t a lI r e le v a n t d a ta a r e in c lu d e d in a

r e v ie w , it is im p o r ta n t to u s e m u ltip le s o u r c e s to id e n tif y

s tu d ie s a n d a s y s te m a tic a p p r o a c h to s e le c t a m o n g th e m I .

A s f o r s o u r c e s , L a tin A m e r ic a a n d C a r ib b e a n h a v e

th e L I L A C S2

, a n e le c tr o n ic d a ta b a s e ( C D - R O M a n d O n

-lin e ) w h ic h in d e x e s r e g io n a llite r a tu r e f r o m m o r e th a n 6 7 0

A ddress for correspondence: A ldem ar A raujo C astro

U nidade de E nsaios C línicos e M eta-A nálise U niversidade F ederal de S ão P aulo R ua P edro de T oledo, 598

S ão P aulo/S P - B rasil- C E P 04039-001

jo u m a ls , w ith 1 6 8 ,9 0 4 c ita tio n s in c o r p o r a te d s in c e 1 9 8 2

a n d a b s tr a c ts in E n g lis h , P o r tu g u e s e o r S p a n is h . T h e

U n ite d S ta te s N a tio n a l L ib r a r y o f M e d ic in e 's m e d ic a I

s u b je e t h e a d in g s ( M e S H ) v o c a b u la r y is u s e d to in d e x e a c h

L I L A C S c ita tio n . L I L A C S is e d ite d b y B I R E M E ( L a tin

A m e r ie a n a n d C a r ib b e a n H e a lth S c ie n e e I n f o r m a tio n

C e n te r ) , in th e e ity o f S ã o P a u lo , B r a z il. C u r r e n tly ,

B I R E M E is a n a g e n c y o f th e P a n - A m e r ic a n H e a lth

O r g a n iz a tio n / W o r ld H e a lth O r g a n iz a tio n .

O f th e 6 7 0 jo u r n a ls in d e x e d in L I L A C S , o n ly 4 1

o v e r la p w ith M E D L I N E - E M B A S E2

• T h e r e f o r e , th e u s e o f

L I L A C S f o r id e n tif y in g c lin ic a I tr ia I s a n d s y s te m a tic r e v ie w s

s h o u ld b e a p a r t o f e v e r y s e a r c h s tr a te g y . T h e C o c h r a n e

S c h iz o p h r e n ia R e v ie w s G r o u p ( C S R G ) , in ju s t o n e p r e v io u s

e f f o f t, id e n tif ie d 1 ,3 9 1 tr ia ls u s in g L I L A C S a lo n e3•

O u r f o e u s w a s to a d a p t th e o p tim a l s e a r e h s tr a te g y

f o r r a n d o m iz e d e o n tr o lle d tr ia ls p r o p o s e d b y th e C o c h r a n e

C o lla b o r a tio n b y in c o r p o r a tin g id e a s f r o m th e C S R G to

f o r m u la te th e o p tim a l s e a r c h s tr a te g y f o r u s in g L I L A C S .

C A S T R O , A .A .; C L A R K , O .A .C .; A T A L L A H , A .N . - O p tim a l s e a rc h s tra te g y fo r c lin ic a i tria ls in th e L a tin A m e ric a n a n d C a rib b e a n H e a lth S c ie n c e L ite ra tu re D a ta b a s e (L 1 L A C S )

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1 4 2 4

O P T IM A L S E A R C H S T R A T E G Y F O R

C L IN IC A L T R IA L S

I n T a b l e 1 w e p r e s e n t t h e o p t i m a l s e a r c h s t r a t e g y t o

b e ü s e d w i t h L I L A C S / C D - R O M , 2 7 t h e d i t i o n , J a n u a r y

1 9 9 7 . T h e s t r a t e g y i s d i v i d e d i n t o t h e f o l l o w i n g t h r e e s t a g e s

a s d e f i n e d i n D i c k e r s e n4 e t a I . a n d r e p J i c a t e d

in

t h e

C o c h r a n e H a n d b o o k : s t a g e o n e ( s e t s 1 - 9 ) i n c l u d e s t e r m s

w i t h h i g h p r e c i s i o n ; s t a g e t w o ( s e t s 1 0 - 2 8 ) i n c l u d e s t e r m s

w i t h m o d e r a t e p r e c i s i o n ; a n d s t a g e t h r e e ( s e t s 2 9 - 3 9 )

i n c l u d e s t e r m s w i t h l o w p r e c i s i o n b u t w i t h o p t i m a l b r o w s e r

s e n s i t i v i t y .

T a b le 1

O p lim a l s e a rc h s lra le g y fo r C lin ic a i T ria ls in lh e L IL A C S .

B ire m e in te rfa c e , 2 7 th e d itio n :

# 1 P t R A N D D M IZ E D C D N T R D L L E D T R IA L # 2 P t C D N T R D L L E D C L IN IC A L T R IA L # 3 M h R A N D D M IZ E D C D N T R D L L E D T R IA L S # 4 M h R A N D D M A L L D C A T ID N

# 5 M h D D U B L E -B L IN D M E T H D D # 6 M h S IN G L E -B L IN D M E T H D O

# 7 # 1 D R # 2 D R # 3 D R # 4 D R # 5 D R # 6

# 8 C t A N IM A L A N O N D T (C t H U M A N a n d C t A N IM A L ) . # 9 # 7 A N O N D T # 8

# 1 0 P t C L IN IC A L T R IA L .

# 1 1 E x E 0 5 .3 1 8 .7 6 0 .5 3 5 $ < e x p lo d e M h C L IN IC A L T R IA L S >

# 1 2 T i c lin $ a n d (T i tria l$ D R T i e n s a $ D R T i e s tu d $ D R T i e x p e rim $ D R T i in v e s tig $ ) # 1 3 A b c lin $ a n d (A b tria l$ D R A b e n s a $ D R A b e s tu d $ D R A b e x p e rim $ O R T i in v e s tig $ ) # 1 4 T i s in g l$ O R T i s im p le $ O R T i d o u b l$ O R T i d o b le $ O R T i d u p lo $ O R T i tre b l$ O R T i trip l$ # 1 5 T i b lin d $ O R T i c e g o $ O R T i c ie g o $ O R T i m a s k $ O R T i m a s c a r$

# 1 6 A b s in g l$ D R A b s im p le $ O R A b d o u b l$ O R A b d o b le $ O R A b d u p lo $ O R A b tre b l$ O R A b trip l$ # 1 7 A b b lin d $ O R A b c e g o $ O R A b c ie g o $ O R A b m a s k $ O R A b m a s c a r$

# 1 8 (# 1 4 a n d # 1 5 ) O R (# 1 6 a n d # 1 7 ) # 1 9 M h P L A C E B O S

# 2 0 T i p la c e b o $ # 2 1 A b p la c e b o $

# 2 2 T i ra n d o m $ D R T i ra n d o n $ O R T i c a s u a l$ O R T i a c a s o $ O R T i a z a r D R T i a le a to r$ # 2 3 A b ra n d o m $ D R A b ra n d o n $ D R A b c a s u a l$ D R A b a c a s o $ D R A b a z a r O R A b a le a to r$ # 2 4 M h R E S E A R C H O E S IG N

# 2 5 # 1 0 O R # 1 1 O R # 1 2 O R # 1 3 O R # 1 5 D R # 1 6 O R # 1 7 O R # 1 '8 O R # 1 9 O R # 2 0 O R # 2 1 # 2 6 C t A N IM A L A N O N D T (C t H U M A N a n d C t A N IM A L )

# 2 7 # 2 5 A N O N O T # 2 6 # 2 8 # 2 7 A N O N O T # 9

# 2 9 C t C O M P A R A T IV E S T U O Y

# 3 0 E x E 0 5 .3 3 7 $ < e x p lo d e M h E V A L U A T IO N S T U O IE S » # 3 1 M h F O L L O W -U P S T U O IE S

# 3 2 M h P R D S P E C T IV E S T U O IE S

# 3 3 T i c o n tro l$ D R T i p ro s p e c tiv $ D R T i v o lu n t$ D R T i v o lu n te e r$ # 3 4 A b c o n tro l$ D R A b p ro s p e c tiv $ D R A b v o lu n t$ D R A b v o lu n te e r$ # 3 5 # 2 9 D R # 3 0 D R # 3 1 D R # 3 2 D R # 3 3 O R # 3 4

# 3 6 C t A N IM A L A N O N D T (C t H U M A N a n d C t A N IM A L ) # 3 7 # 3 5 A N O N D T # 3 6

# 3 8 # 3 4 A N O N D T (# 9 D R # 2 5 ) # 3 9 # 9 D R # 2 8 D R # 3 8

. U p p e r c a s e d e n o te s c o n tro lle d v o c a b u la ry .

. L o w e r c a s e d e n o te s fre e -te x t te rm s .

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D IS C U S S IO N

U s in g th e o p tim a l s e a rc h s tra te g y , a re id e n tify in g 3 8 ,2 6 1 c ita tio n s , in c o n tra s t w ith 3 ,5 0 5 c ita tio n s re trie v e d b y th e C S R G h a v e b e e n id e n tifie d s e a rc h s tra te g y . O n ly R C T s a n d C C T s w ill b e s e le c te d fro m a m o n g th e s e c ita tio n s . U n d e r th e a u s p ic e s o f th e C o c h ra n e C o lla b o ra tio n , w ith e a c h n e w e d itio n o fL IL A C S , w e w ill b e lo c a tin g5 n e w R C T s a n d C C T s fo r th e C o c h ra n e

C o n tro lle d T ria ls R e g is te r in th e C o c h ra n e L ib ra ry . In a d d itio n , w e w ill b e w o rk in g re tro s p e c tiv e ly b y lo c a tin g c lin ic a I tria ls in o ld re c o rd s o f L IL A C S , th ro u g h th e C L IN T -L A C P R O J E C T (C lin ic a I T ria ls in th e L a tin A m e ric a n a n d C a rib b e a n P ro je c t). T h is e ffo rt is b e in g c o o rd in a te d b y th e B ra z ilia n C o c h ra n e C e n te r (h ttp ://

w w w .e p m .b r/c o c h ra n e ).

A t p re s e n t, o f th e 3 1 C o c h ra n e R e v ie w s G ro u p s , o n ly th e C S R G is u s in g L IL A C S . J u s t tw o o th e rs , th e H e p a to -B ilia ry a n d P e rip h e ra l V a s c u la r D is e a s e R e v ie w s G ro u p s , m e n tio n L IL A C S a s a n e le c tro n ic D a ta b a s e th a t w ill b e s e a rc h e d in th e n e a r fu tu re . W e o b s e rv e d th is a fte r v e rify in g th e s e a rc h s tra te g y o f e a c h g ro u p 6 .

A s n o n -E n g lis h -Ia n g u a g e re fe re n c e s a re u n d e r-re p r-re s e n te d in M E D L IN E , a n d o n ly p u b lis h e d a rtic le s a re in c lu d e d , th e re e x is ts th e p o te n tia l fo r p u b lic a tio n b ia s4

,7

-1 0 a n d la n g u a g e b ia sll1 2 T h u s , th e in c lu s io n o f L IL A C S

in a n y s e a rc h s tra te g y s h o u ld b e m a n d a to ry .

A s fo r te c h n o lo g y re q u ire m e n ts , d u rin g in s ta lla tio n o f th e D O S -b a s e d s o ftw a re fo r L IL A C S /C D -R O M , a n . in te rfa c e fo r th re e la n g u a g e s is a v a ila b le , s o th a t o p tin g to

1 4 2 5

u s e E n g lis h fo r th e s e a rc h is e a s y . T h e p rin c ip a l d iffic u lty is th a t s a v in g th e s tra te g y to flo p p y d is k is im p o s s ib le . O n ly e x p e rt k n o w le d g e w ill re s o lv e th is p ro b le m .

A n u p d a te o f th e s e a rc h s tra te g y c o u ld b e n e c e s s a ry . T h e h e a d in g s a n d fre e te x t s e a rc h te rm s re q u irin g e v a lu a tio n a re : C R O S S O V E R T R IA L , V E R S U S , P R O P H IL A T IC T H E R A P E U T IC T R A IL . It is fu n d a m e n ta l to u n d e rs ta n d .s o m e im p o rta n t u s e r p rin c ip le sl3

in s e le c tin g M e S H o r N o n -M e S H te rm s fo r d a ta b a s e s e a rc h e s .

T h e s e a rc h s tra te g y fo r q u e s tio n s c o n c e rn in g p a tie n ts h a s th re e p a rts : d is e a s e , in te rv e n tio n , a n d s tu d y d e s ig nl4

U p to n o w , a ll d is c u s s io n h a s b e e n re le v a n t o n ly fo r th e s e a rc h s tra te g y fo r lo c a tin g s tu d y d e s ig n ; it h a s fa ile d to c o n s id e r th e s e a rc h s tra te g y fo r id e n tify in g th e d is e a s e a n d th e in te rv e n tio n .

T h e s e a rc h e x p re s s io n fo r lo c a tin g c lin ic a I tria ls / s tu d y d e s ig n is : [(D is e a s e A N D In te rv e n tio n ) A N D S tu d y D e s ig n ]. A n a lo g o u s ly , it w ill b e n e c e s s a ry to e la b o ra te a s e a rc h s tra te g y fo r th e d is e a s e a n d th e in te rv e n tio n u s in g h e a d in g s a n d te x t fre e . T h e h e a d in g s c o u ld v e rify th e m e a n s , e x p lo d in g if n e c e s s a ry . T e x t fre e (s u b je c t) w ill b e s y n o n y m s , p lu ra l, d iffe re n t m a n n e r o f w ritin g , a n d c o rre s p o n d e n t w o rd s in E n g lis h , P o rtu g u e s e a n d S p a n is h la n g u a g e s w ill b e in d is p e n s a b le . O b v io u s ly , fu rth e r d e v e lo p m e n t is n e c e s s a ry in th is a re a .

In c o n c lu s io n , th ro u g h c o n s ta n t e ffo rts to e la b o ra te a n d im p ro v e a s e a rc h s tra te g y fo r e le c tro n ic d a ta b a s e s , w e a re a p p ro a c h in g th e id e a l. W e b e lie v e th a t th is c o lla b o ra tiv e w 9 rk is th e b e s t w a y to re d u c e b ia s in lo c a tin g a n d s e le c tin g c lin ic a I tria ls .

C A S T R O , A .A .; C L A R K , O .A .C .; A T A L L A H , A .N . - O p tim a l s e a rc h s tra te g y fo r c lin ic a i tria ls in th e L a tin A m e ric a n a n d C a rib b e a n H e a lth S c ie n c e L ite ra tu re D a ta b a s e (L 1 L A C S )

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1426

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o f h o m e o p a th y , a sc o rb ic a c id fo r c o m m o n c o ld a n d g in k g o

b ilo b a fo r c e re b ra l in su ffic ie n c y a n d in te rm itte n t c la u d ic a tio n .

P h a rm W e e k b l S c i 1 9 9 2 ; 1 4 :3 1 6 -2 0 .

1 1 . S m ith B J, D a rz in s P J, Q u in n M , H e lle r R F . M o d e m m e th o d s

o f se a rc h in g th e m e d ic a I lite ra tu re . M e d J A u st 1 9 9 2 ;

1 5 7 (9 ):6 0 3 -1 1 .

1 2 . R a m o sR e m u s C , S u a re z A lm a z o r M , O o rg a n M , G o m e z

-V a rg a s A , R u sse ll A S . P e rfo rm a n c e o f o n lin e b io m e d ic a l

d a ta b a se s in rh e u m a to lo g y . J R h e u m a to l1 9 9 4 ; 2 1 (1 0 ): 1 9 1 2

-2 1 .

1 3 . L o w e H J, B a m e tt G O . U n d e sta n tin g a n d u sin g th e m e d ic a I

su b je c t h e a d in g s (M e S H ) v o c a b u la ry to p e rfo rm lite ra tu re

stu d ie s. JA M A 1 9 9 4 ;2 7 1 :1 1 0 3 -1 1 0 8 .

1 4 . M c K IB B O N , K A , W A L K E R -O IL K S C J. H o w to se a rc h fo r

a n a rtic le a b o u t d ia g n o sis. A C P J C lu b 1 9 9 4 ;1 2 1 (1 ):A 1 0 .

S ã o P a u lo M e d ic a i J o u rn a llR P M 1 1 5 (3 ): 1 4 2 3 -1 4 2 6 , 1 9 9 7 C A S T R O , A .A .; C L A R K , O .A .C .; A T A L L A H , A .N . - O p tim a l s e a rc h s tra te g y fo r c lin ic a i tria ls

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