H.K. Ma

632 total citations
28 papers, 449 citations indexed

About

H.K. Ma is a scholar working on Public Health, Environmental and Occupational Health, Pediatrics, Perinatology and Child Health and Surgery. According to data from OpenAlex, H.K. Ma has authored 28 papers receiving a total of 449 indexed citations (citations by other indexed papers that have themselves been cited), including 10 papers in Public Health, Environmental and Occupational Health, 9 papers in Pediatrics, Perinatology and Child Health and 8 papers in Surgery. Recurrent topics in H.K. Ma's work include Ectopic Pregnancy Diagnosis and Management (6 papers), Gestational Trophoblastic Disease Studies (6 papers) and Chronic Disease Management Strategies (4 papers). H.K. Ma is often cited by papers focused on Ectopic Pregnancy Diagnosis and Management (6 papers), Gestational Trophoblastic Disease Studies (6 papers) and Chronic Disease Management Strategies (4 papers). H.K. Ma collaborates with scholars based in Hong Kong, China and United States. H.K. Ma's co-authors include L.C. Wong, Yew Cheong Choo, Patricia A. King, S. J. Duthie, Hys Ngan, Pak Chung Ho, Chan Yuen Fook, W.S.B. Yeung, Anupam Ghosh and J. S. K. Woo and has published in prestigious journals such as PLoS ONE, American Journal of Obstetrics and Gynecology and International Journal of Environmental Research and Public Health.

In The Last Decade

H.K. Ma

27 papers receiving 431 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
H.K. Ma Hong Kong 12 205 166 162 123 61 28 449
D. Jannet France 12 302 1.5× 158 1.0× 133 0.8× 89 0.7× 112 1.8× 29 496
E Borowiack United Kingdom 7 247 1.2× 71 0.4× 97 0.6× 106 0.9× 117 1.9× 18 397
Nisha Lakhi United States 13 197 1.0× 82 0.5× 121 0.7× 153 1.2× 58 1.0× 62 507
Duria A. Rayis Sudan 15 300 1.5× 237 1.4× 80 0.5× 45 0.4× 37 0.6× 45 588
Ulaş Solmaz Türkiye 15 322 1.6× 165 1.0× 140 0.9× 144 1.2× 63 1.0× 55 632
Misgav Rottenstreich Israel 13 413 2.0× 290 1.7× 244 1.5× 150 1.2× 65 1.1× 131 734
P Barton United Kingdom 9 206 1.0× 97 0.6× 154 1.0× 50 0.4× 205 3.4× 15 602
Donna M Neale United States 12 437 2.1× 279 1.7× 139 0.9× 132 1.1× 39 0.6× 21 614
Haroon Hasan Canada 14 232 1.1× 230 1.4× 137 0.8× 98 0.8× 75 1.2× 29 617
P. C Hannaford United Kingdom 10 105 0.5× 96 0.6× 238 1.5× 37 0.3× 87 1.4× 15 592

Countries citing papers authored by H.K. Ma

Since Specialization
Citations

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

Fields of papers citing papers by H.K. Ma

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by H.K. Ma. 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 H.K. Ma. The network helps show where H.K. Ma may publish in the future.

Co-authorship network of co-authors of H.K. Ma

This figure shows the co-authorship network connecting the top 25 collaborators of H.K. Ma. A scholar is included among the top collaborators of H.K. Ma 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 H.K. Ma. H.K. Ma 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.
Lai, Francisco Tsz Tsun, Eliza Lai‐Yi Wong, Rex Wong, et al.. (2021). Association of volunteer-administered home care with reduced emergency room visits and hospitalization among older adults with chronic conditions: A propensity-score-matched cohort study. International Journal of Nursing Studies. 127. 104158–104158. 5 indexed citations
2.
Chung, Gary Ka-Ki, Siu‐Ming Chan, Terry Cheuk‐Fung Yip, et al.. (2021). Differential Impacts of Multimorbidity on COVID-19 Severity across the Socioeconomic Ladder in Hong Kong: A Syndemic Perspective. International Journal of Environmental Research and Public Health. 18(15). 8168–8168. 17 indexed citations
3.
Chen, Cynthia, H.K. Ma, Bee Choo Tai, et al.. (2014). The Synergistic Effect of Functional Status and Comorbidity Burden on Mortality: A 16-Year Survival Analysis. PLoS ONE. 9(8). e106248–e106248. 23 indexed citations
4.
Ngan, Hys, et al.. (1996). Post-treatment serial serum squamous cell carcinoma antigen (SCC) in the monitoring of squamous cell carcinoma of the cervix. International Journal of Gynecological Cancer. 6(2). 115–119. 6 indexed citations
5.
Ho, Pak Chung & H.K. Ma. (1993). Termination of second trimester pregnancy with sulprostone and mifepristone: A randomized double-blind placebo-controlled trial. Contraception. 47(2). 123–129. 10 indexed citations
6.
Fook, Chan Yuen, Pak Chung Ho, & H.K. Ma. (1993). Blood loss in termination of early pregnancy by vacuum aspiration and by combination of mifepristone and gemeprost. Contraception. 47(1). 85–95. 26 indexed citations
7.
Choy, D., L.C. Wong, Jonathan S. T. Sham, Hys Ngan, & H.K. Ma. (1993). Dose-Tumor Response for Carcinoma of Cervix: An Analysis of 594 Patients Treated by Radiotherapy. Gynecologic Oncology. 49(3). 311–317. 24 indexed citations
8.
King, Patricia A., S. J. Duthie, & H.K. Ma. (1991). Grand multiparity: A reappraisal of the risks. International Journal of Gynecology & Obstetrics. 36(1). 13–16. 36 indexed citations
9.
King, Patricia A., S. J. Duthie, & H.K. Ma. (1990). Intestinal helminths in pregnant Vietnamese refugees. Transactions of the Royal Society of Tropical Medicine and Hygiene. 84(5). 723–723. 1 indexed citations
10.
Wong, L.C., R Collins, Hys Ngan, & H.K. Ma. (1990). Etoposide combination chemotherapy in refractory ovarian malignant germ cell tumor. Gynecologic Oncology. 39(2). 123–126. 5 indexed citations
11.
King, Patricia A., et al.. (1990). Obstetric outcome among Vietnamese refugees in Hong Kong: an age‐matched case‐controlled study. International Journal of Gynecology & Obstetrics. 33(3). 203–210. 11 indexed citations
12.
Wong, L.C., Hys Ngan, & H.K. Ma. (1989). Primary treatment with vincristine, dactinomycin and cyclophosphamide in nondysgerminomatous germ cell tumor of the ovary. Gynecologic Oncology. 34(2). 155–158. 7 indexed citations
13.
King, Patricia A., et al.. (1989). Secondary Postpartum Haemorrhage. Australian and New Zealand Journal of Obstetrics and Gynaecology. 29(4). 394–398. 64 indexed citations
14.
Wong, L.C., Yew Cheong Choo, & H.K. Ma. (1985). Methotrexate with citrovorum factor rescue in gestational trophoblastic disease. American Journal of Obstetrics and Gynecology. 152(1). 59–62. 39 indexed citations
15.
Wong, L.C., Yew Cheong Choo, & H.K. Ma. (1984). Use of oral VP16-213 as primary chemotherapeutic agent in treatment of gestational trophoblastic disease. American Journal of Obstetrics and Gynecology. 150(8). 924–927. 14 indexed citations
16.
Ghosh, Anupam, et al.. (1984). Fetal loss from umbilical cord abnormalities — a difficult case for prevention. European Journal of Obstetrics & Gynecology and Reproductive Biology. 18(4). 183–198. 36 indexed citations
17.
Ho, Pak‐Cheong, L.C. Wong, J.W.M. Lawton, & H.K. Ma. (1984). Mixed Lymphocyte Reaction in Hydatidiform Mole. American journal of reproductive immunology. 6(1). 25–27.
18.
Ho, Pak‐Cheong, L.C. Wong, J.W.M. Lawton, & H.K. Ma. (1984). Mixed lymphocyte reaction in gestational trophoblastic disease: presence of a specific plasma inhibitor of the response to paternal alloantigens. Journal of Reproductive Immunology. 6(2). 105–110. 3 indexed citations
19.
Ho, Pak Chung, Sung‐Tzu Liang, Grace Tang, & H.K. Ma. (1983). Pre-operative cervical dilatation in termination of first trimester pregnancies using 16, 16-dimethyl-trans- Δ2 PGE1 methyl ester vaginal pessaries. Contraception. 27(4). 339–346. 6 indexed citations
20.
Ma, H.K., et al.. (1978). Can treatment of carcinoma of the cervix be individualized?. Gynecologic Oncology. 6(2). 206–215. 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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