@incollection{,
	
					
					
					C5E9B171E0EF16F886495C7FA74070B8
					10.1002/uog.12300/pdf
				,
	author={{Luis RaAl MartAnezGonzAlez} and {Province Center of Medical Genetics}},
	journal={{Global Journal of Medical Research}},
	journal={{GJMR}}2249-46180975-588810.34257/GJMR,
	address={Cambridge, United States},
	publisher={Global Journals Organisation}1422734
}

@book{b0,
	
	
		,
	title={{The worldwide incidence of preterm birth: a systematic review of maternal mortality and morbidity. Bull World Health Organ}}
		,
	author={{
			SBeck
		} and {
			DWojdyla
		} and {
			LSay
		} and {
			APBetran
		} and {
			MMerialdi
		} and {
			JHRequejo
		}}
		
		
		
		
		
		
	
	,
	note={Internet}

}

@incollection{b1,
	
	
		,
	title={{Transvaginal ultrasonographic measurement of cervical length in asymptomatic high-risk women with a shortcervical length in the previous pregnancy}}
		,
	author={{
			JMCrane
		} and {
			DHutchens
		}}
		
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
			25
			,
	year={2008. Feb 2013}
		
	
	,
	note={Internet}

}

@book{b2,
	
	
		,
	title={{}}
		10.1002/uog.5323/pdf
		
		
			31
		
	
	,
	note={aprox. 9 p.]. Disponible en}

}

@incollection{b3,
	
	
		,
	title={{Use of transvaginal ultrasonography to predict preterm birth in women with a history of preterm birth}}
		,
	author={{
			JMCrane
		} and {
			DHutchens
		}}
		
		aprox. 6
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
			32
			5
			25
			,
	year={2008. Feb 2013}
		
	
	,
	note={Internet}

}

@book{b4,
	
	
		,
	title={{}}
		10.1002/uog.6143/pdf
		
		
	

}

@incollection{b5,
	
	
		,
	title={{Transvaginal ultrasonography of the cervix to predict preterm birth in women with uterine anomalies}}
		,
	author={{
			JAiroldi
		} and {
			VBerghella
		} and {
			HSehdev
		} and {
			JLudmir
		}}
		
		
		
		
	
	
		,
	journal={{Obstet Gynecol}}
		
			106
			3
			25
			,
	year={2005. Feb 2013}
		
	
	,
	note={Internet. aprox. 4 p.}

}

@incollection{b6,
	
	
		,
	title={{}}
	
	
		,
	journal={{/Transvaginal_Ultrasonography_of_the_Cervix_to.1. aspx}}
		
	

}

@book{b7,
	
	
		,
	title={{Casos clínicos: medición cervical. Técnica y errores. En: Actualización en obstetricia y ginecología}}
		,
	author={{
			LópezCriado
		} and {
			MS
		} and {
			SontallaAguilar
		} and {
			TMolina F Manz Bromn
		} and {
			JEManzanares
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			S
		}}
		
		
		
		
		
		
			,
	year={2009}
		
	

}

@incollection{b8,
	
	
		,
	title={{Proteomics of amniotic fluid in assessment of the placenta. Relevance for preterm birth}}
		,
	author={{
			IABuhimschi
		} and {
			CSBuhimschi
		}}
		
	
	
		,
	journal={{Placenta}}
		
	
	,
	note={Internet}

}

@incollection{b9,
	
	
		,
	title={{Cervical funneling sonographic predictive of preterm delivery ultrasound}}
		,
	author={{
			VBerghella
		} and {
			KKuhlman
		} and {
			SWeiner
		}}
		
		
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
	
	,
	note={Internet}

}

@book{b10,
	
	
		,
	title={{}}
		10.1046/j.1469-0705.1997.10030161.x/pdf
		
		
	

}

@incollection{b11,
	
	
		,
	title={{Ultrasound assessment of the cervix}}
		,
	author={{
			VBerghella
		} and {
			YBega
		} and {
			JTolosa
		}}
		
		
		14595237
	
	
		,
	journal={{Clin Obstet Gynecol}}
		
			46
			4
			
			,
	year={Dec 2003}
		
	

}

@incollection{b12,
	
	
		,
	title={{Clinical significance of the presence of amniotic fluid 'sludge' in asymptomatic patients at high risk forspontaneous preterm delivery}}
		,
	author={{
			JPKusanovic
		} and {
			JEspinoza
		} and {
			RRomero
		} and {
			LFGoncalves
		} and {
			JKNien
		} and {
			ESoto
		}}
		
		
		
		
		
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
			30
			5
			25
			,
	year={2007. Feb 2013}
		
	
	,
	note={Internet. aprox. 9 p.}

}

@book{b13,
	
	
		,
	title={{}}
		10.1002/uog.4081/pdf
		
		
	

}

@book{b14,
	
	
		,
	title={{Marcadores ecográficos de prematuridad. La longitud cervical. En: Parto pretérmino. Madrid: Médica Panamericana}}
		,
	author={{
			CarrerasMoratonas
		} and {
			E
		} and {
			CrispiBrillas
		} and {
			F
		}}
		
		
		
		
			,
	year={2004}
			
		
	

}

@incollection{b15,
	
	
		,
	title={{Reference range for cervical length throughout pregnancy: non-parametric LMS-based model applied to a large sample}}
		,
	author={{
			LJSalomón
		} and {
			DíazGarcía
		} and {
			CBernard
		} and {
			JPVille
		} and {
			Y
		}}
		
		
		
		
		10.1002/uog.6332/pdf
		
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
			33
			4
			25
			,
	year={2009. Feb 2013}
		
	
	,
	note={aprox. 6 p.}

}

@book{b16,
	
	
		,
	title={{En: Ultrasonografía diagnóstica fetal, obstétrica y ginecológica. La Habana: Editorial Ciencias Médicas}}
		,
	author={{
			OlivaRodríguez
		} and {
			JAParto
		}}
		
		
			,
	year={2010}
			
		
	
	,
	note={Valor de la ultrasonografía vaginal}

}

@incollection{b17,
	
	
		,
	title={{Asociación entre cervicometría y parto prematuro en pacientes con sospecha de trabajo de parto pretérmino inicial}}
		,
	author={{
			AGonzález
		} and {
			HDonado
		} and {
			DFAgudelo
		} and {
			HDMejías
		} and {
			CBPeñaronda
		}}
		
		
		
		
		
	
	
		,
	journal={{Rev Obstet Ginecol}}
		
			56
			2
			25
			,
	year={2005. Feb 2013}
		
	
	,
	note={Internet. aprox. 7 p.]. Disponible en}

}

@incollection{b18,
	
	
		,
	title={{Prenatal and perinatal management of preterm labours}}
		,
	author={{
			MKoucky
		} and {
			AGermanota
		} and {
			ZHajek
		} and {
			AParizek
		} and {
			MKalvosova
		} and {
			PKopecky
		}}
		
		
		
		
		
		20059879
	
	
		,
	journal={{Prague Med Rep}}
		
			110
			4
			
			,
	year={2009}
		
	

}

@incollection{b19,
	
	
		,
	title={{}}
		,
	author={{
			NápolesMéndez
		} and {
			D
		}}
		
		
	
	
		,
	booktitle={{La cervicometría en la valoración del parto pretérmino. MEDI-SAN}}
		
			16
			1
			25
			,
	year={2012. Feb 2013}
		
	
	,
	note={Internet. aprox. 16 p.]. Disponible en}

}

@book{b20,
	
	
		,
	title={{Patients with an asymptomatic short cervix (< or = 15 mm) have a high rate of subclinical intraamniotic inflammation: implications for patient counseling}}
		
	

}

@incollection{b21,
	
	
		,
	title={{}}
		Internet]. 2010
		
	
	
		,
	journal={{Am J Obstet Gynecol}}
		
			202
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			25
			,
	year={Feb 2013}
		
	
	,
	note={aprox. 8 p.]. Disponible en}

}

@incollection{b22,
	
	
		,
	title={{Cervicometry: all women need to knowmidwifery today}}
		,
	author={{
			KFurink
		}}
	
	
		,
	journal={{Int Midwife}}
		
			85
			
			,
	year={2008}
		
	

}

@incollection{b23,
	
	
		,
	title={{Significance of ultrasound vaginal cervicometry in predicting preterm delivery}}
		,
	author={{
			MMára
		} and {
			PCalda
		} and {
			LHaaková
		} and {
			ZZizka
		} and {
			ADohnalová
		} and {
			JZivný
		}}
		
		
		
		
		
		12011784
	
	
		,
	journal={{Med Sci Monit}}
		
			8
			5
			
			,
	year={May 2002}
		
	

}

@incollection{b24,
	
	
		,
	title={{Prior cone biopsy: prediction of preterm birth by cervical ultrasound}}
		,
	author={{
			VBerghella
		} and {
			LPereira
		} and {
			AGariepy
		} and {
			GSimonazzi
		}}
		
		
		
	
	
		,
	journal={{Am J Obstet Gynecol}}
		
			,
	year={Oct 2004}
		
	

}

@incollection{b25,
	
	
		,
	title={{Gestational age at cervical length measurement and incidence of preterm birth}}
		,
	author={{
			VBerghella
		} and {
			ARoman
		} and {
			CDaskalakis
		} and {
			ANess
		} and {
			JKBaxter
		}}
		
		
		
		
	
	
		,
	journal={{Obstet Gynecol}}
		
			110
			2
			25
			,
	year={2007. Feb 2013}
		
	
	,
	note={Internet. aprox}

}

@incollection{b26,
	
	
		,
	title={{Clinical significance of early (<20 weeks) vs. Late (20-24 weeks) detection of sonographic short cérvix in asymptomatic women in the mid-trimester}}
		,
	author={{
			EVaisbuch
		} and {
			RRomero
		} and {
			OErez
		} and {
			JPKusanovic
		} and {
			SMazaki-Tovi
		} and {
			FGotsch
		}}
		
		
		
		
		
		10.1002/uog.7673/pdf
		
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
			36
			4
			25
			,
	year={Feb 2013}
		
	
	,
	note={Internet]. 2010. aprox. 11 p.]. Disponible en}

}

@incollection{b27,
	
	
		,
	title={{Ultrasonic attenuation estimation of the pregnant cervix: a preliminary report}}
		,
	author={{
			BLMcfarlin
		} and {
			TABigelow
		} and {
			YLaybed
		} and {
			WDO'brien
		} and {
			MLOelze
		} and {
			JSAbramowicz
		}}
		
		
		
		
		
		10.1002/uog.7643/pdf
		Internet]. 2010
		
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
			36
			2
			25
			,
	year={Feb 2013}
		
	
	,
	note={aprox. 8 p.}

}

@incollection{b28,
	
	
		,
	title={{Transvaginal cervical length measurement for prediction of preterm birth in women with threatened preterm labor: a metaanalysis}}
		,
	author={{
			ASotiriadis
		} and {
			SPapatheodorou
		} and {
			AKavvadias
		} and {
			GMakrydimas
		}}
		
		
		
		10.1002/uog.7643/pdf
	
	
		,
	journal={{Obstet Gynecol}}
		
			25
			,
	year={2010}
		
	
	,
	note={Internet. citado}

}

@book{b29,
	
	
		,
	title={{}}
		10.1002/uog.7457/pdf
		
		
			,
	year={Feb 2013}
			35
		
	
	,
	note={aprox. 11 p.}

}

@incollection{b30,
	
	
		,
	title={{Prevention of preterm delivery in twin gestations (PREDICT): a multicenter, randomized, placebo-controlled trial on the effect of vaginal micronized progesterone}}
		,
	author={{
			LRode
		} and {
			KKlein
		} and {
			KHNicolaides
		} and {
			EKrampl-Bettelheim
		} and {
			ATabor
		}}
		
		
		
		
		10.1002/uog.7457/pdf
		
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
			38
			3
			25
			,
	year={2011. Feb 2013}
		
	
	,
	note={Internet. aprox. 9 p.}

}

@incollection{b31,
	
	
		,
	title={{Universal cervicallength screening to prevent preterm birth: a costeffectiveness analysis}}
		,
	author={{
			EFWerner
		} and {
			CSHan
		} and {
			CMPettker
		} and {
			CSBuhimschi
		} and {
			JACopel
		} and {
			EFFunaiand
		}}
		
		
		
		
		
		aprox. 6
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
			38
			1
			25
			,
	year={2011. Feb 2013}
		
	
	,
	note={Internet}

}

@book{b32,
	
	
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	title={{}}
		10.1002/uog.8911/pdf
		
		
	

}

@incollection{b33,
	
	
		,
	title={{Eficacia de los progestágenos en la amenaza de parto pretérmino}}
		,
	author={{
			Mora
		} and {
			Cabré Irene
		}}
		
	
	
		,
	journal={{Ginecología y Obstetricia Clínica}}
		
			5
			2
			
			,
	year={2004}
		
	

}

@incollection{b34,
	
	
		,
	title={{Perinatal outcome in women treated with progesterone for the prevention of preterm birth: a meta-analysis}}
		,
	author={{
			ASotiriadis
		} and {
			APapatheodorou
		} and {
			GMakrydimas
		}}
		
		
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
			40
			3
			25
			,
	year={2012. Feb 2013}
		
	
	,
	note={Internet. aprox}

}

@book{b35,
	
	
		,
	title={{}}
		10.1002/uog.11178/pdf
		
		
	

}

@incollection{b36,
	
	
		,
	title={{Prophylactic administration of progesterone by vaginal suppository to reduce the incidence of spontaneous preterm birth in women at increased risk: a randomized placebo-controlled double-blind study}}
		,
	author={{
			EBDa Fonseca
		} and {
			REBittar
		} and {
			MHCarvalho
		} and {
			MZugaib
		}}
		
		
		
		12592250
	
	
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			2
			
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	year={Feb 2003}
		
	

}

@incollection{b37,
	
	
		,
	title={{Progesterone for preterm birth prevention: an evolving intervention}}
		,
	author={{
			ATTita
		} and {
			DJRouse
		}}
		
		19254577
	
	
		,
	journal={{Am J Obstet Gynecol}}
		
			200
			3
			
			,
	year={Mar 2009}
		
	

}

@incollection{b38,
	
	
		,
	title={{Administración prenatal de progesterona para la prevención del parto prematuro}}
		,
	author={{
			JMDodd
		} and {
			VFlenady
		} and {
			RCincotta
		} and {
			CACrowther
		}}
		
		
		
		10.1002/14651858.CD004947
	
	
		,
	journal={{Cochrane Database of Systematic Reviews}}
		
			D004947
			,
	year={2008}
		
	

}

@incollection{b39,
	
	
		,
	title={{Cervical length changes during preterm cervical ripening: effects of 17-alpha-hydroxyprogesterone caproate}}
		,
	author={{
			F1Facchinetti
		} and {
			SPaganelli
		} and {
			GComitini
		} and {
			GDante
		} and {
			AVolpe
		}}
		
		
		
		
		17466698
	
	
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	year={May 2007}
		
	

}

@book{b40,
	
	
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	title={{Vaginal progesterone reduces the rate of preterm birth in women with a sonographic short cervix: a multicenter}}
		,
	author={{
			SHassan
		} and {
			RRomero
		} and {
			DVidyadhari
		} and {
			SFusey
		} and {
			KJBaxter
		} and {
			MKhandelwal
		}}
		
		
		
		
		
		
	
	,
	note={randomized, double-blind, placebo-controlled trial}

}

@incollection{b41,
	
	
		,
	title={{}}
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
			,
	year={2011}
		
	
	,
	note={Internet}

}

@incollection{b42,
	
	
		,
	title={{}}
		10.1002/uog.9017/pdf
		
	
	
		,
	journal={{Ene}}
		
			38
			1
			,
	year={2014}
		
	
	,
	note={aprox. 12 p.}

}

@book{b43,
	
	
		,
	title={{Valor de la cervicometría y la fibronectina}}
		,
	author={{
			SManzanares
		} and {
			SetefillaLópez
		} and {
			MRedondo
		} and {
			PGarrote
		} and {
			AMolina
		} and {
			F
		} and {
			PazCarrillo
		} and {
			M
		}}
		
		
		
		
		
		
		
		aprox. 10
		
		
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	year={2009. Sep 2011. 2012}
			12
		
	
	,
	note={Actualización en obstetricia y ginecología. pdf 34. Donoso B, Oyarzún E. Premature deliery. Medwave [Internet. citado 9 Ene 2014}

}

@book{b44,
	
	
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	title={{}}
		10.1002/uog.9017/pdf
		
		
	

}

@incollection{b45,
	
	
		,
	title={{Failure of 17-hydroxyprogesterone to reduce neonatal morbidity or prolong triplet pregnancy: a double-blind, randomized clinical trial}}
		,
	author={{
			CACombs
		} and {
			TGarite
		} and {
			KMaurel
		} and {
			ADas
		} and {
			MPorto
		}}
		
		
		
		
		20816146
	
	
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	journal={{Am J Obstet Gynecol}}
		
			203
			3
			
			,
	year={Sep 2010}
		
	

}

@incollection{b46,
	
	
		,
	title={{Universal cervical-length screening and vaginal progesterone prevents early preterm births, reduces neonatal morbidity and is cost saving: doing nothing is no longer an option}}
		,
	author={{
			SCampbell
		}}
		10.1002/uog.9073/pdf
		
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
			38
			1
			,
	year={2011}
		
	
	,
	note={Internet. citado 9 Ene 2014. aprox. 9 p.}

}

@incollection{b47,
	
	
		,
	title={{Pharmacokinetics of 17-hydroxyprogesterone caproate in multifetal gestation}}
		,
	author={{
			SNCaritis
		} and {
			SSharma
		} and {
			RVenkataramanan
		} and {
			DJRouse
		} and {
			AMPeaceman
		} and {
			ASciscione
		}}
		
		
		
		
		
	
	
		,
	journal={{Am JObstet Gynecol}}
		
	
	,
	note={Internet}

}

@incollection{b48,
	
	
		,
	title={{Universal cervical length screening and treatment with vaginal progesterone to prevent preterm birth: a decision and economic analysis}}
		,
	author={{
			AGCahill
		} and {
			AOOdibo
		} and {
			ABCaughey
		} and {
			DMStamilio
		} and {
			SSHassan
		} and {
			GAMacones
		}}
		
		
		
		
		
		
	
	
		,
	journal={{Am J Obstet Gynecol}}
		
			202
			6
			,
	year={2010}
		
	
	,
	note={Internet. citado 10 Ene 2014. aprox. 16 p.}

}

@incollection{b49,
	
	
		,
	title={{Progesterone supplementation and the prevention of preterm birth}}
		,
	author={{
			ERNorwitz
		} and {
			ABCaughey
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		,
	journal={{Rev Obstet Gynecol}}
		
			4
			2
			,
	year={2011. 2014}
		
	
	,
	note={Internet. citado 10 Ene. aprox. 12 p.]. Disponible en}

}

@incollection{b50,
	
	
		,
	title={{Vaginal progesterone, cerclage or cervical pessary for preventing preterm birth in asymptomatic singleton pregnant women with history of preterm birth and a sonographic short cervix}}
		,
	author={{
			ZAlfirevic
		} and {
			JOwen
		} and {
			CarrerasMoratonas
		} and {
			ESharp
		} and {
			ANSzychowski
		} and {
			JMGoya
		} and {
			M
		}}
		
		
		
		
		
		
	
	
		,
	journal={{Ultrasound Obstet Gynecol}}
		
			41
			2
			,
	year={2013}
		
	
	,
	note={Internet. citado 10 Ene 2014. aprox. 5 p.}

}