John O’Brien

7.2k total citations · 2 hit papers
91 papers, 2.8k citations indexed

About

John O’Brien is a scholar working on Epidemiology, Obstetrics and Gynecology and Public Health, Environmental and Occupational Health. According to data from OpenAlex, John O’Brien has authored 91 papers receiving a total of 2.8k indexed citations (citations by other indexed papers that have themselves been cited), including 33 papers in Epidemiology, 33 papers in Obstetrics and Gynecology and 30 papers in Public Health, Environmental and Occupational Health. Recurrent topics in John O’Brien's work include Preterm Birth and Chorioamnionitis (27 papers), Pregnancy-related medical research (18 papers) and Pregnancy and preeclampsia studies (15 papers). John O’Brien is often cited by papers focused on Preterm Birth and Chorioamnionitis (27 papers), Pregnancy-related medical research (18 papers) and Pregnancy and preeclampsia studies (15 papers). John O’Brien collaborates with scholars based in United States, United Kingdom and South Africa. John O’Brien's co-authors include J R Barton, Elvis S. Donaldson, George W. Creasy, Elçin Çetingöz, Sonia S. Hassan, Roberto Romero, K. H. Nicolaides, Eduardo Da Fonseca, John R. Barton and Agustín Conde‐Agudelo and has published in prestigious journals such as Blood, International Journal of Molecular Sciences and Journal of Clinical Microbiology.

In The Last Decade

John O’Brien

81 papers receiving 2.7k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Vaginal progesterone in women with an asymptomatic sonographic short cervix in the midtrimester decreases preterm delivery and neonatal morbidity: a systematic review and metaanalysis of individual patient data

2011 395 citations Roberto Romero, K. H. Nicolaides et al. American Journal of Obstetrics and Gynecology profile →
Vaginal progesterone for preventing preterm birth and adverse perinatal outcomes in singleton gestations with a short cervix: a meta-analysis of individual patient data

2017 307 citations Roberto Romero, Agustín Conde‐Agudelo et al. American Journal of Obstetrics and Gynecology profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
John O’Brien United States	22	1.4k	1.4k	1.2k	1.1k	260	91	2.8k
Qiuhong Zhao United States	30	3.0k 2.1×	1.1k 0.8×	241 0.2×	1.9k 1.8×	73 0.3×	150	4.2k
Barış Ata Türkiye	36	2.0k 1.4×	998 0.7×	65 0.1×	1.2k 1.1×	39 0.1×	206	3.9k
Christopher P. Howson United States	15	421 0.3×	328 0.2×	599 0.5×	665 0.6×	676 2.6×	35	2.1k
Anita L. Nelson United States	27	1.2k 0.8×	492 0.4×	199 0.2×	521 0.5×	41 0.2×	130	2.0k
Kelechi Nnoaham United Kingdom	17	731 0.5×	1.0k 0.7×	155 0.1×	65 0.1×	59 0.2×	27	2.5k
Xuechen Yu United States	13	715 0.5×	1.7k 1.3×	220 0.2×	585 0.5×	162 0.6×	21	3.7k
Tapio Luostarinen Finland	36	210 0.1×	239 0.2×	1.9k 1.6×	70 0.1×	320 1.2×	84	3.6k
J Peto United Kingdom	15	224 0.2×	319 0.2×	2.6k 2.2×	81 0.1×	410 1.6×	22	4.2k
Tim Farley Switzerland	18	1.3k 0.9×	214 0.2×	92 0.1×	501 0.5×	13 0.1×	33	2.1k
Vicente A. Benítes-Zapata Peru	21	273 0.2×	234 0.2×	384 0.3×	152 0.1×	70 0.3×	153	2.0k

Countries citing papers authored by John O’Brien

Since Specialization

Citations

This map shows the geographic impact of John O’Brien's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by John O’Brien with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites John O’Brien more than expected).

Fields of papers citing papers by John O’Brien

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John O’Brien. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by John O’Brien. The network helps show where John O’Brien may publish in the future.

Co-authorship network of co-authors of John O’Brien

This figure shows the co-authorship network connecting the top 25 collaborators of John O’Brien. A scholar is included among the top collaborators of John O’Brien based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with John O’Brien. John O’Brien is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Thomas, Marie, Davor Frleta, KehDih Lai, et al.. (2025). Interplay of procoagulatory and neutrophil-derived anticoagulatory proteins in C1q-NET–driven blood coagulation. Blood. 146(24). 2993–3002.

Shoemaker, Robin, Marko Poglitsch, Hong Huang, et al.. (2023). Association of Elevated Serum Aldosterone Concentrations in Pregnancy with Hypertension. Biomedicines. 11(11). 2954–2954. 3 indexed citations

Conde‐Agudelo, Agustín, Roberto Romero, Eduardo Da Fonseca, et al.. (2018). Vaginal Progesterone Is as Effective as Cervical Cerclage to Prevent Preterm Birth in Women With a Singleton Gestation, Previous Spontaneous Preterm Birth, and a Short Cervix: Updated Indirect Comparison Meta-analysis. Obstetrical & Gynecological Survey. 73(12). 674–676.

Chavan, Niraj R., et al.. (2018). Smoking during pregnancy increases chemerin expression in neonatal tissue. Experimental Physiology. 104(1). 93–99. 4 indexed citations

Conde‐Agudelo, Agustín, Roberto Romero, K. H. Nicolaides, et al.. (2012). Vaginal progesterone vs cervical cerclage for the prevention of preterm birth in women with a sonographic short cervix, previous preterm birth, and singleton gestation: a systematic review and indirect comparison metaanalysis. American Journal of Obstetrics and Gynecology. 208(1). 42.e1–42.e18. 114 indexed citations

O’Brien, John, et al.. (2011). EMDR, Addictions, and the Stages of Change: A Road Map for Intervention. Journal of EMDR Practice and Research. 5(3). 121–130. 5 indexed citations

Romero, Roberto, K. H. Nicolaides, Agustín Conde‐Agudelo, et al.. (2011). Vaginal progesterone in women with an asymptomatic sonographic short cervix in the midtrimester decreases preterm delivery and neonatal morbidity: a systematic review and metaanalysis of individual patient data. American Journal of Obstetrics and Gynecology. 206(2). 124.e1–124.e19. 395 indexed citations breakdown →

O’Brien, John, et al.. (2010). EMDR Treatment of Comorbid PTSD and Alcohol Dependence: A Case Example. Journal of EMDR Practice and Research. 4(2). 50–59. 23 indexed citations

O’Brien, John & David F. Lewis. (2009). Progestins for the prevention of spontaneous preterm birth: review and implications of recent studies.. PubMed. 54(2). 73–87. 8 indexed citations

10.

O’Brien, John, et al.. (2009). Uterine Activity in Women Receiving 17 α-Hydroxyprogesterone Caproate for the Prevention of Preterm Birth: An Observational Study. American Journal of Perinatology. 27(2). 157–162. 8 indexed citations

11.

O’Brien, John, et al.. (2005). Modifiable risk factors for growth restriction in twin pregnancies. American Journal of Obstetrics and Gynecology. 192(5). 1440–1442. 17 indexed citations

12.

Cottrill, Hope M., et al.. (2004). Factors influencing maternal perception of uterine contractions. American Journal of Obstetrics and Gynecology. 190(5). 1455–1457. 4 indexed citations

13.

O’Brien, John, et al.. (2002). Gelatin Sponge Embolization. Fetal Diagnosis and Therapy. 17(1). 8–10. 18 indexed citations

14.

O’Brien, John, et al.. (2002). Funneling to the stitch: an informative ultrasonographic finding after cervical cerclage. Ultrasound in Obstetrics and Gynecology. 20(3). 252–255. 29 indexed citations

15.

Mogensen, G., Seppo Salminen, John O’Brien, et al.. (2002). Food microorganisms: Health benefits, safety evaluation and strains with documented history of use in foods. Bulletin. International Dairy Federation. 377(377). 4–9. 44 indexed citations

16.

O’Brien, John, et al.. (2001). An in vitro model and case report that used gelatin sponge to restore amniotic fluid volume after spontaneous premature rupture of the membranes. American Journal of Obstetrics and Gynecology. 185(5). 1094–1097. 6 indexed citations

17.

O’Brien, John, B.M. Mercer, & Baha M. Sibai. (1995). The use of a modified vaginal pouch for the diagnosis and management of premature rupture of the membranes. American Journal of Obstetrics and Gynecology. 172(5). 1565–1566. 3 indexed citations

18.

Mercer, Brian M., et al.. (1995). Early versus late amniotomy for labor induction: A randomized trial. American Journal of Obstetrics and Gynecology. 173(4). 1321–1325. 29 indexed citations

19.

Parkhouse, James & John O’Brien. (1984). Medical and dental training and staffing in a region--the long and short of it.. BMJ. 288(6432). 1773–1775. 6 indexed citations

20.

O’Brien, John, et al.. (1972). A COMPLICATION OF CRYOPROSTATECTOMY. British Journal of Urology. 44(6). 713–715. 1 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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