Chikahiro Oka

594 total citations
12 papers, 406 citations indexed

About

Chikahiro Oka is a scholar working on Public Health, Environmental and Occupational Health, Reproductive Medicine and Pediatrics, Perinatology and Child Health. According to data from OpenAlex, Chikahiro Oka has authored 12 papers receiving a total of 406 indexed citations (citations by other indexed papers that have themselves been cited), including 9 papers in Public Health, Environmental and Occupational Health, 6 papers in Reproductive Medicine and 4 papers in Pediatrics, Perinatology and Child Health. Recurrent topics in Chikahiro Oka's work include Reproductive Biology and Fertility (8 papers), Assisted Reproductive Technology and Twin Pregnancy (4 papers) and Reproductive Health and Technologies (3 papers). Chikahiro Oka is often cited by papers focused on Reproductive Biology and Fertility (8 papers), Assisted Reproductive Technology and Twin Pregnancy (4 papers) and Reproductive Health and Technologies (3 papers). Chikahiro Oka collaborates with scholars based in Japan. Chikahiro Oka's co-authors include Tetsunori Mukaida, Tetsuya Goto, K. Takahashi, Katsuhiko Takahashi, Tatsuhiro Tomiyama, Kentaro Takahashi, Tsunehisa Makino, Ken‐ichi Iwasaki, R Iizuka and Toshitaka Sugi and has published in prestigious journals such as Human Reproduction, Fertility and Sterility and European Journal of Obstetrics & Gynecology and Reproductive Biology.

In The Last Decade

Chikahiro Oka

12 papers receiving 382 citations

Peers

Chikahiro Oka

PHEOH

PPCH

J.R. Alegretti Brazil

Samer Tannus Canada

Selwyn P. Oskowitz United States

Enzo Troilo Italy

Tammie K. Roy United Kingdom

Rosella Lisi United Kingdom

V. Loup France

M.E. Jamieson United Kingdom

N De Munck Belgium

Yehia Amin Egypt

J.R. Alegretti Brazil

Chikahiro Oka

331 ×1.0

PHEOH

403 ×1.5

128 ×0.7

PPCH

73 ×0.9

116 ×2.2

Citations per year, relative to Chikahiro Oka Chikahiro Oka (= 1×) peers J.R. Alegretti

Countries citing papers authored by Chikahiro Oka

Since Specialization

Citations

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

Fields of papers citing papers by Chikahiro Oka

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Chikahiro Oka

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

All Works

Sort: Min cites: Since: Top N: Style:

12 of 12 papers shown

Mukaida, Tetsunori, Tetsuya Goto, Tomoo Tajima, Chikahiro Oka, & Keisuke Takahashi. (2012). Perinatal outcome of children born after vitrification of blastocysts (6467 cycles with 2059 babies in 12 years experiences). Fertility and Sterility. 98(3). S65–S65. 1 indexed citations

Mukaida, Tetsunori & Chikahiro Oka. (2012). Vitrification of oocytes, embryos and blastocysts. Best Practice & Research Clinical Obstetrics & Gynaecology. 26(6). 789–803. 29 indexed citations

Kyono, Koichi, et al.. (2011). When is the actual splitting time of the embryo to develop a monozygotic dichorionic diamniotic (DD) twins following a single embryo transfer?. Fertility and Sterility. 96(3). S275–S275. 3 indexed citations

Mukaida, Tetsunori, Chikahiro Oka, Tetsuya Goto, & K. Takahashi. (2006). Artificial shrinkage of blastocoeles using either a micro-needle or a laser pulse prior to the cooling steps of vitrification improves survival rate and pregnancy outcome of vitrified human blastocysts. Human Reproduction. 21(12). 3246–3252. 155 indexed citations

Takahashi, Katsuhiko, Tetsunori Mukaida, Tetsuya Goto, & Chikahiro Oka. (2005). Perinatal outcome of blastocyst transfer with vitrification using cryoloop: A 4-year follow-up study. Fertility and Sterility. 84(1). 88–92. 120 indexed citations

Mukaida, Tetsunori, K. Takahashi, Tetsuya Goto, & Chikahiro Oka. (2005). Ultra-rapid Vitrification Using a Cryoloop Technique for Human Blastocyst Cryopreservation. Fertility and Sterility. 84. S476–S476. 4 indexed citations

Takahashi, Katsuhiko, Tetsunori Mukaida, Tatsuhiro Tomiyama, Tetsuya Goto, & Chikahiro Oka. (2004). GnRH Antagonist Improved Blastocyst Quality and Pregnancy Outcome After Multiple Failures of IVF/ICSI–ET with a GnRH Agonist Protocol. Journal of Assisted Reproduction and Genetics. 21(9). 317–322. 35 indexed citations

Goto, Tetsuya, Chikahiro Oka, Tatsuhiro Tomiyama, Tetsunori Mukaida, & Katsuhiko Takahashi. (2003). Single dose nasal spray of gonadotropin releasing hormone (GnRH) agonist effectively matures oocytes for in vitro fertilization in an ovarian stimulation protocol using clomiphene citrate, gonadotropin, and GnRH antagonist. Fertility and Sterility. 80. 6–6. 5 indexed citations

Mukaida, Tetsunori, et al.. (2002). Clinical outcome after transfer of human blastocysts (BLs) vitrified on day 5 and on day 6 with a cryoloop technique. Fertility and Sterility. 78. S12–S12. 1 indexed citations

10.

Takahashi, Kentaro, Tetsunori Mukaida, Tatsuhiro Tomiyama, & Chikahiro Oka. (2000). High Pregnancy Rate After Hysteroscopy with Irrigation in Uterine Cavity Prior to Blastocyst Transfer in Patients Who Have Failed to Conceive After Blastocyst Transfer. Fertility and Sterility. 74(3). S206–S206. 18 indexed citations

11.

Makino, Tsunehisa, et al.. (1992). Survey of 1120 Japanese women with a history of recurrent spontaneous abortions. European Journal of Obstetrics & Gynecology and Reproductive Biology. 44(2). 123–130. 33 indexed citations

12.

Oka, Chikahiro, et al.. (1991). Chemical abortion in patients with recurrent fetal loss.. PubMed. 43(2). 239–40. 2 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.

Explore authors with similar magnitude of impact