Calvin Chama

427 total citations
23 papers, 87 citations indexed

About

Calvin Chama is a scholar working on Pediatrics, Perinatology and Child Health, Obstetrics and Gynecology and Public Health, Environmental and Occupational Health. According to data from OpenAlex, Calvin Chama has authored 23 papers receiving a total of 87 indexed citations (citations by other indexed papers that have themselves been cited), including 11 papers in Pediatrics, Perinatology and Child Health, 9 papers in Obstetrics and Gynecology and 7 papers in Public Health, Environmental and Occupational Health. Recurrent topics in Calvin Chama's work include Global Maternal and Child Health (7 papers), Maternal and fetal healthcare (5 papers) and Pregnancy and preeclampsia studies (4 papers). Calvin Chama is often cited by papers focused on Global Maternal and Child Health (7 papers), Maternal and fetal healthcare (5 papers) and Pregnancy and preeclampsia studies (4 papers). Calvin Chama collaborates with scholars based in Nigeria, Switzerland and United Kingdom. Calvin Chama's co-authors include Babagana Bako, Ado Danazumi Geidam, Bala Mohammed Audu, Hadiza Galadanci, Lamaran Makama Dattijo, Muhammad Baffah Aminu, Rosemary Ogu, Adetokunbo Olusegun Fabamwo, Hyacinth E. Onah and Friday Okonofua and has published in prestigious journals such as SHILAP Revista de lepidopterología, BJOG An International Journal of Obstetrics & Gynaecology and International Journal of Gynecology & Obstetrics.

In The Last Decade

Calvin Chama

20 papers receiving 75 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Calvin Chama Nigeria 6 44 32 28 22 10 23 87
Marta Buoncristiano Italy 2 37 0.8× 28 0.9× 23 0.8× 35 1.6× 9 0.9× 2 89
Thitiporn Siriwachirachai Thailand 4 47 1.1× 29 0.9× 21 0.8× 37 1.7× 5 0.5× 8 88
Parichehr Pooransari Iran 7 46 1.0× 30 0.9× 31 1.1× 13 0.6× 2 0.2× 23 97
Corinne Floch-Tudal France 7 63 1.4× 11 0.3× 45 1.6× 12 0.5× 9 0.9× 9 103
Giulia Zamagni Italy 6 37 0.8× 37 1.2× 15 0.5× 19 0.9× 5 0.5× 30 97
Megha Singh United Kingdom 5 26 0.6× 29 0.9× 19 0.7× 11 0.5× 2 0.2× 16 87
Emily F. Cornish United Kingdom 6 36 0.8× 86 2.7× 43 1.5× 19 0.9× 2 0.2× 12 165
Simachew Animen Bante Ethiopia 6 39 0.9× 13 0.4× 15 0.5× 53 2.4× 2 0.2× 13 104
Tadesse Gure Ethiopia 7 82 1.9× 56 1.8× 22 0.8× 58 2.6× 3 0.3× 21 158
Ángel Honrado United Kingdom 3 27 0.6× 35 1.1× 22 0.8× 44 2.0× 4 93

Countries citing papers authored by Calvin Chama

Since Specialization
Citations

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

Fields of papers citing papers by Calvin Chama

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Calvin Chama

This figure shows the co-authorship network connecting the top 25 collaborators of Calvin Chama. A scholar is included among the top collaborators of Calvin Chama 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 Calvin Chama. Calvin Chama is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Adanikin, Abiodun Idowu, Jamilu Tukur, Tina Lavin, et al.. (2024). Establishment of Maternal and Perinatal Database for Quality, Equity and Dignity programme: Processes, challenges, lessons and prospects. BJOG An International Journal of Obstetrics & Gynaecology. 131(S3). 5–19.
2.
Adanikin, Abiodun Idowu, et al.. (2024). Determinants of obstructed labour and associated outcomes in referral hospitals in Nigeria. BJOG An International Journal of Obstetrics & Gynaecology. 131(S3). 55–63. 1 indexed citations
3.
Chama, Calvin, et al.. (2022). Implementation and evaluation of obstetric early warning systems in tertiary care hospitals in Nigeria. SHILAP Revista de lepidopterología. 2(7). e0000225–e0000225. 2 indexed citations
4.
Okon, Kenneth O., et al.. (2020). Haematological Profile of Pregnant Women Attending Antenatal Clinic in Bauchi, Nigeria. Open Journal of Obstetrics and Gynecology. 10(12). 1776–1787. 2 indexed citations
5.
Chama, Calvin, Saturday Etuk, & Olufemi T. Oladapo. (2020). The Pattern and Spectrum of Severe Maternal Morbidities in Nigerian tertiary Hospitals.. African Journal of Reproductive Health. 24(2). 115–122. 3 indexed citations
6.
Aminu, Muhammad Baffah, et al.. (2019). Factors responsible for discontinuation of long-term reversible contraceptives in a tertiary facility in Northeastern Nigeria. Port Harcourt Medical Journal. 13(2). 67. 3 indexed citations
7.
Okon, Kenneth O., et al.. (2019). Low Prevalence of Asymptomatic Malaria in Pregnancy among Subjects Attending Antenatal Clinic at a Tertiary Hospital in Bauchi, Nigeria: A Preliminary Report. Journal of Advances in Medicine and Medical Research. 1–8. 1 indexed citations
8.
Aminu, Muhammad Baffah, et al.. (2018). Laparoscopy for evaluation of infertility patients in a tertiary center in north-eastern Nigeria. 1(2). 1 indexed citations
9.
Aminu, Muhammad Baffah, et al.. (2017). Polypectomy as a Complete Therapy for Leiomyosarcoma of the Cervix Uteri: An Unusual Treatment. International Journal of Women s Health and Reproduction Sciences. 7(3). 412–414. 1 indexed citations
10.
Chama, Calvin, et al.. (2013). A shortened versus standard matched postpartum magnesium sulphate regimen in the treatment of eclampsia: a randomised controlled trial.. PubMed. 17(3). 131–6. 6 indexed citations
11.
Choongo, Kennedy, et al.. (2012). Parity differences in heat expression of dairy cows synchronized with GnRH, CIDR and PGF2α during dry season in Zambia.. Pakistan Veterinary Journal. 32(1). 131–133. 3 indexed citations
12.
Chama, Calvin, et al.. (2010). An Assessment of Policies and Programs for Reducing Maternal Mortality in Borno State, Nigeria. African Journal of Reproductive Health. 14(3). 49–54. 8 indexed citations
13.
Chama, Calvin, et al.. (2009). Normal CD4 T-lymphocyte baseline in healthy HIV-negative pregnant women. Journal of Obstetrics and Gynaecology. 29(8). 702–704. 5 indexed citations
14.
Bako, Babagana, et al.. (2008). AN 8 YEAR CLINICAL REVIEW OF ANTEPARTUM HAEMORRHAGE AT THE UNIVERSITY OF MAIDUGURI TEACHING HOSPITAL, MAIDUGURI .. 3 indexed citations
15.
Chama, Calvin, et al.. (2005). The Natural History of Placenta Praevia in a Nigerian Population. Tropical Journal of Obstetrics and Gynaecology. 21(2). 2 indexed citations
16.
Audu, Bala Mohammed, et al.. (2003). Complications of cervical cerclage in women with cervical incompetence. International Journal of Gynecology & Obstetrics. 83(3). 299–300. 6 indexed citations
17.
Audu, Bala Mohammed, et al.. (2003). Diagnostic features of cervical incompetence among women in Maiduguri. Journal of Obstetrics and Gynaecology. 23(2). 130–133. 2 indexed citations
18.
Chama, Calvin, et al.. (2002). Severe burn injury in pregnancy in Northern Nigeria. Journal of Obstetrics and Gynaecology. 22(1). 20–22. 12 indexed citations
19.
Chama, Calvin, et al.. (2001). A longitudinal study of amniotic fluid index in normal pregnancy in Nigerian women. International Journal of Gynecology & Obstetrics. 72(3). 223–227. 9 indexed citations
20.
Akpede, George O., et al.. (1997). Paediatric and teenage gynaecological disorders in Northern Nigeria. Annals of Tropical Paediatrics. 17(3). 229–232. 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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2026