Greg Ryan

9.9k total citations · 1 hit paper
251 papers, 5.7k citations indexed

About

Greg Ryan is a scholar working on Pediatrics, Perinatology and Child Health, Surgery and Pulmonary and Respiratory Medicine. According to data from OpenAlex, Greg Ryan has authored 251 papers receiving a total of 5.7k indexed citations (citations by other indexed papers that have themselves been cited), including 114 papers in Pediatrics, Perinatology and Child Health, 108 papers in Surgery and 46 papers in Pulmonary and Respiratory Medicine. Recurrent topics in Greg Ryan's work include Prenatal Screening and Diagnostics (64 papers), Congenital Diaphragmatic Hernia Studies (64 papers) and Assisted Reproductive Technology and Twin Pregnancy (54 papers). Greg Ryan is often cited by papers focused on Prenatal Screening and Diagnostics (64 papers), Congenital Diaphragmatic Hernia Studies (64 papers) and Assisted Reproductive Technology and Twin Pregnancy (54 papers). Greg Ryan collaborates with scholars based in Canada, United States and United Kingdom. Greg Ryan's co-authors include Rory Windrim, Lisa K. Hornberger, David Chitayat, Edgar Jaeggi, Edmond Kelly, P. Gareth R. Seaward, Tim Van Mieghem, Jacob C. Langer, Ants Toi and John‏ Kingdom and has published in prestigious journals such as New England Journal of Medicine, Circulation and SHILAP Revista de lepidopterología.

In The Last Decade

Greg Ryan

233 papers receiving 5.5k citations

Hit Papers

align trajectories sort by overperformance

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.

Randomized Trial of Fetal Surgery for Severe Left Diaphragmatic Hernia

2021 205 citations Jan Deprest, K. H. Nicolaides et al. New England Journal of Medicine profile →

Author Peers

Peers are selected by citation overlap in the author's most active subfields. citations · hero ref

Author						Papers	Cites
Greg Ryan	2.5k	2.2k	1.3k	881	862	251	5.7k
R. Douglas Wilson	3.4k 1.4×	3.1k 1.4×	1.2k 1.0×	476 0.5×	1.4k 1.7×	200	6.7k
Kenneth J. Moise	1.4k 0.6×	3.7k 1.7×	948 0.7×	990 1.1×	1.8k 2.1×	261	7.2k
Alfred Abuhamad	1.3k 0.5×	4.7k 2.1×	733 0.6×	1.3k 1.5×	2.9k 3.4×	217	7.1k
Sailesh Kumar	1.0k 0.4×	3.1k 1.4×	860 0.7×	520 0.6×	2.3k 2.7×	262	5.6k
Lawrence D. Platt	1.5k 0.6×	4.6k 2.1×	1.1k 0.9×	1.3k 1.5×	2.3k 2.7×	235	7.3k
U. Gembruch	3.2k 1.3×	5.2k 2.4×	2.1k 1.6×	2.7k 3.1×	3.3k 3.8×	567	9.9k
Sean C. Blackwell	613 0.2×	3.3k 1.5×	668 0.5×	928 1.1×	3.3k 3.8×	180	5.6k
Rory Windrim	898 0.4×	3.2k 1.4×	408 0.3×	396 0.4×	2.7k 3.2×	192	4.9k
Enrico Lopriore	1.2k 0.5×	6.5k 2.9×	1.8k 1.4×	578 0.7×	3.4k 3.9×	418	9.6k
P W Callen	3.1k 1.3×	2.7k 1.2×	1.5k 1.2×	577 0.7×	583 0.7×	172	6.0k

Countries citing papers authored by Greg Ryan

Since Specialization

Citations

This map shows the geographic impact of Greg Ryan'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 Greg Ryan with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Greg Ryan more than expected).

Fields of papers citing papers by Greg Ryan

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Greg Ryan. 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 Greg Ryan. The network helps show where Greg Ryan may publish in the future.

Co-authorship network of co-authors of Greg Ryan

This figure shows the co-authorship network connecting the top 25 collaborators of Greg Ryan. A scholar is included among the top collaborators of Greg Ryan 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 Greg Ryan. Greg Ryan 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

Lanna, Mariano, Y. Ville, Liesbeth Lewi, et al.. (2025). Single fetal demise in twin anemia–polycythemia sequence: perinatal outcome of surviving cotwin. Ultrasound in Obstetrics and Gynecology. 66(1). 51–55. 1 indexed citations

Abbasi, Nimrah, Tim Van Mieghem, & Greg Ryan. (2024). Fetal therapy for congenital diaphragmatic hernia: past, present and future. World Journal of Pediatric Surgery. 7(3). e000835–e000835. 1 indexed citations

Sichitiu, Joanna, Fawaz Alkazaleh, Roel de Heus, et al.. (2024). Maternal “mirror” syndrome: Evaluating the benefits of fetal therapy. Prenatal Diagnosis. 44(8). 979–987. 1 indexed citations

Johnson, Anthony, et al.. (2023). The Management of Acardiac Twinning: Twin Reverse Arterial Perfusion Sequence – An International Survey. Fetal Diagnosis and Therapy. 50(6). 446–453. 6 indexed citations

Puligandla, Pramod S., Erik D. Skarsgard, Robert Baird, et al.. (2023). Diagnosis and management of congenital diaphragmatic hernia: a 2023 update from the Canadian Congenital Diaphragmatic Hernia Collaborative. Archives of Disease in Childhood Fetal & Neonatal. 109(3). 239–252. 23 indexed citations

Baschat, Ahmet, Magdalena Sanz Cortés, Holly L. Hedrick, et al.. (2023). Fetoscopic Endoluminal Tracheal Occlusion for Severe, Left-Sided Congenital Diaphragmatic Hernia. Obstetrics and Gynecology. 143(3). 440–448. 8 indexed citations

Baschat, Ahmet, Holly L. Hedrick, Foong‐Yen Lim, et al.. (2023). Fetoscopic endoluminal tracheal occlusion (FETO) versus expectant care of severe left-diaphragmatic hernia in north america. American Journal of Obstetrics and Gynecology. 228(1). S44–S45. 1 indexed citations

Deprest, Jan, K. H. Nicolaides, Alexandra Benachi, et al.. (2021). Randomized Trial of Fetal Surgery for Severe Left Diaphragmatic Hernia. New England Journal of Medicine. 385(2). 107–118. 205 indexed citations breakdown →

Calster, Ben Van, Alexandra Benachi, K. H. Nicolaides, et al.. (2021). The randomized Tracheal Occlusion To Accelerate Lung growth (TOTAL)-trials on fetal surgery for congenital diaphragmatic hernia: reanalysis using pooled data. American Journal of Obstetrics and Gynecology. 226(4). 560.e1–560.e24. 36 indexed citations

10.

Agrawal, Swati, Nimrah Abbasi, Abhaya V. Kulkarni, et al.. (2021). Correlation of fetal ventricular size and need for postnatal cerebrospinal fluid diversion surgery in open spina bifida. Ultrasound in Obstetrics and Gynecology. 59(6). 799–803. 7 indexed citations

11.

Deprest, Jan, K. H. Nicolaides, Alexandra Benachi, et al.. (2021). Randomized Trial of Fetal Surgery for Severe Left Diaphragmatic Hernia. Obstetrical & Gynecological Survey. 76(12). 724–725. 27 indexed citations

12.

Tollenaar, Lisanne S.A., Femke Slaghekke, Liesbeth Lewi, et al.. (2020). Treatment and outcome of 370 cases with spontaneous or post‐laser twin anemia–polycythemia sequence managed in 17 fetal therapy centers. Ultrasound in Obstetrics and Gynecology. 56(3). 378–387. 30 indexed citations

13.

Whitehead, Clare, Greg Ryan, Jan Deprest, et al.. (2020). Development of a Core outcome set for fetal Myelomeningocele (COSMiC): study protocol. Trials. 21(1). 732–732. 7 indexed citations

14.

Deprest, Jan, Mahesh Choolani, Frank A. Chervenak, et al.. (2020). Fetal Diagnosis and Therapy during the COVID-19 Pandemic: Guidance on Behalf of the International Fetal Medicine and Surgery Society. Fetal Diagnosis and Therapy. 47(9). 689–698. 26 indexed citations

15.

Garbowski, Maciej, Gareth Seaward, Rory Windrim, et al.. (2019). Is There a Role for Titre Monitoring in Kell Alloimmunized Pregnancies?. Blood. 134(Supplement_1). 1174–1174. 4 indexed citations

16.

Veeken, Lennart Van der, Francesca Maria Russo, Luc De Catte, et al.. (2018). Fetoscopic endoluminal tracheal occlusion and reestablishment of fetal airways for congenital diaphragmatic hernia. Gynecological Surgery. 15(1). 9–9. 53 indexed citations

17.

Moon‐Grady, Anita J., Ahmet Baschat, Darrell L. Cass, et al.. (2017). Fetal Treatment 2017: The Evolution of Fetal Therapy Centers - A Joint Opinion from the International Fetal Medicine and Surgical Society (IFMSS) and the North American Fetal Therapy Network (NAFTNet). Fetal Diagnosis and Therapy. 42(4). 241–248. 52 indexed citations

18.

Chalouhi, G. E., Anne‐Maude Morency, José María Blázquez Martínez, et al.. (2017). Prenatal incision of ureterocele causing bladder outlet obstruction: a multicenter case series. Prenatal Diagnosis. 37(10). 968–974. 10 indexed citations

19.

Mieghem, Tim Van, Roel de Heus, Liesbeth Lewi, et al.. (2014). Prenatal Management of Monoamniotic Twin Pregnancies. Obstetrics and Gynecology. 124(3). 498–506. 52 indexed citations

20.

Moore, Lynette, et al.. (1997). Intra-abdominal varix of the umbilical vein—Is it an indication for fetal karyotyping?. American Journal of Obstetrics and Gynecology. 176(1). S93–S93. 18 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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