Instruction For Authors

General Information

A cover letter, addressing to the Co-Editors-in-Chief, Dr Ngai-Yin Chan, must affirm that the manuscript is not under simultaneous consideration elsewhere and it has not been previously published in a similar form. No part of a paper, published by JHKCC, may be reproduced or published elsewhere without the prior written permission of the author(s) and the publisher. The author(s) is(are) responsible for the entire manuscript. JHKCC disclaims all responsibility for such material. No product or service advertised in this publication is guaranteed or warranted by the Editors of publisher. Neither the Editors nor publisher guarantee any claims made by a manufacturer or author in regard to a product or service. If a trademark item is named, the name(s) and address(es) of the manufacturer(s) or supplier(s), in addition to the generic name, should be foot-noted.

In addition, an Author Declaration Form has to be submitted and it can be downloaded here: Author Declaration Form

Publication Ethics

Studies should comply with the Declaration of Helsinki. For human studies, a statement in the manuscript should be included declaring that the study obtained ethics approval with the name of the ethics committee or institutional review board documented. It should also be stated that either the subjects gave informed consent before participation or the requirement for informed consent was waived by an ethics committee or institutional review board.

Prospective human clinical trials must have been pre-registered in a clinical trial database. For these articles, the registration number and the name of the database should be included.

For studies involving animals, a statement should be included declaring that the study obtained ethics approval with the name of the relevant ethics committee or institutional review board documented.

Conflict of Interest

All authors must declare any conflict of interest. When submitting a manuscript via the online submission system (Editorial Manager), you will be asked whether you have any conflict of interest. As the submitting author, it is your responsibility to ascertain any conflict of interest from your co-authors and to highlight that accordingly. If you are unable to declare conflict of interest on behalf of your co-authors, all contributing authors will need to complete and upload Conflict of Interest Forms to the journal submission site.

In addition, all authors must submit a statement of Conflict of Interest to be published at the end of their manuscript before the section of References. If there is no Conflict of Interest to be declared, this will be stated in the manuscript using the following wording: “Conflict of interest: none declared”.

The Conflict of Interest Forms can be downloaded here: COI Disclosure Form.

Transfer of Copyright

In consideration of the action of the JHKCC in reviewing and editing a manuscript submitted for publication, the author(s) will transfer, assign or otherwise convey all copyright ownership to the JHKCC in the event that such work is accepted for publication by the JHKCC.

Submission of Manuscripts

JHKCC operates a web-based system (Editorial Manager) for manuscript submission and peer-review process. For submission, please go to the online submission system via the JHKCC website and follow the instructions given on screen. First-time users must register and enter the required information. The system will then send you an automatic email with your user name and password. Detailed guidelines are available at the Editorial Manager site by clicking “Help” or viewing the author tutorial.

You will be asked to supply information about your manuscript and then attach your files containing the text of the manuscript and any figures and tables. Editorial Manager will create a PDF file from your submitted data, which is the format in which the manuscript will be made available to the editors and reviewers during the peer-review process.

Manuscripts should be submitted as Microsoft Word documents. Tables and figures are preferably prepared and submitted in separate files. They may be included in the manuscript file, but must appear at the end of the text on separate sheets without embedding in the text. Electronically submitted figures should be in high resolution and in one of the following formats: tiff, bitmap (.bmp), jpeg (.jpg), portable data format (.pdf), postscript (.ps or .eps) or as PowerPoint or Excel files. Should the manuscript be accepted, the original photographs may be required for use in the production process. Tables may be submitted as Word tables, or in .rtf format.

You will be required to enter the Abstract and Keywords during the submission process. These may be copied and pasted from the manuscript document, but must still appear in the manuscript itself. You may suggest names and email addresses of reviewers in the “Enter Comments” section of your electronic submission. When completing the “Add Authors” section, please enter the names and countries of all the authors listed in the manuscript.

Articles Categories

  1. Original articles
    Original articles refer to clinical investigations based on either normal subjects or patients, or experimental studies involving animals. Articles are usually limited to 3,500 words (excluding references, tables and figures), up to 4 figures and 4 tables (or a combined total of tables and figures that is not greater than 8) and 20 references.
  2. Reviews
    JHKCC publishes scholarly and comprehensive reviews with the aims of summarizing and evaluating critically research in the field addressed and identifying future implications. Reviews are usually by invitation. However, unsolicited submissions may be considered. Reviews should not exceed 5,000 words, 5 figures, 5 tables and 150 references.
  3. Case reports
    JHKCC publishes case reports presenting the diagnosis, treatment and follow-up of a patient with an unusual or unique aspect. Preliminary information on a technique or idea that is likely to find widespread application is preferred. Case report should not exceed 1,000 words structured under the headings of “Introduction”, “Case report” and “Discussion”. An unstructured abstract not exceeding 100 words is required. A maximum of up to 3 figures is allowed.
  4. Editorials
    Editorials provides comment, context and critique of articles published in JHKCC. Papers in this section can also be written to provide focused coverage of topical issues in cardiovascular medicine and related disciplines which are of high current interests and potentials. All editorials should be limited to 1,500 words and 10 references, which must include a reference to the original article where applicable. Editorials should be by invitation.
  5. Letters to the Editor
    Letters to the Editor should not exceed 500 words and should focus on a specific article published in the JHKCC within the preceding 12 weeks. No original data may be included. The number of references is limited to a maximum of 5. Authors will receive pre-publication proofs and the authors of the article cited will be invited to reply.

Manuscript Preparation

  • Text
    The manuscript should be typed on one side only on A4 paper, double spaced using 2.5cm wide margins all round. The manuscript text should be arranged as follows: Title page, Structured Abstract and Keywords, Introduction, Methods, Results, Discussion, Acknowledgements, References, Tables (preferably to be submitted as a separate file), Figure Legends. For review articles, the format may be altered, if necessary; an abstract is not required but keywords should be provided. References, tables and figures should be numbered in the order they are cited in the text. Generic names should be used for drugs and instruments whenever possible.
  • Title page
    The title page should contain: (a) title of the manuscript, (b) name(s) of the authors, (c) institution(s) where work was done, (d) addresses of all authors, (e) name of author to whom proofs should be sent, with complete postal address, telephone and fax numbers, and email address.
  • Abstracts and keywords
    An abstract should be typed double spaced. It is followed by a list of three to six keywords. For an original article, it should not exceed 250 words and should be structured under the following headings: (a) Background, (b) Methods, (c) Results and (d) Conclusions. For a review, it can be unstructured and should not exceed 250 words. For a case report, it should not exceed 100 words and should be unstructured.
  • Acknowledgements
    Acknowledgements and details of support in the form of grants, equipment or drugs are typed at the end of the text before the section of References and statement on "Conflict of Interest".
  • References
    References are identified in the text by Arabic numerals and numbered in the order cited. References are typed double spaced on sheets separate from the text in the Vancouver style. Complete information should be given for each reference, including title of article, abbreviated journal title and inclusive page numbers. The first six authors should be listed, followed by et al.
    Chan NY, Choy CC. Screening for atrial fibrillation in 13,122 Hong Kong citizens with smartphone electrocardiogram. Heart 2017;103(1):24-31.
    Chan NY, Choy CC, Lau CL, Lo YK, Chu PS, Yuen HC, et al. Persistent iatrogenic atrial
    septal defect after pulmonary vein isolation by cryoballoon: an under-recognized complication.
    Europace 2011;13(10):1406-10.

  • Figures
    Submitted figures should be in high resolution and in one of the following formats: tiff, bitmap (.bmp), jpeg (.jpg), portable data format (.pdf), postscript (.ps or .eps) or as Powerpoint or Excel files. The resolution required for publication is 300-500 dpi. Figure legends have to be included in the text following tables.
  • Tables
    Tables are preferably submitted as separate files. They can also be typed on separate sheets in the text with table number (in Arabic numerals) and title above and any explanatory notes below.
  • Declaration by authors
    An Author Agreement Form, signed by all authors stating that they have seen and approved the manuscript and that the work has not been, and will not be, published elsewhere, should be uploaded to the submission system at the same time as the manuscript is submitted.
  • Units and abbreviations
    Please use SI units of measurement. Avoid abbreviations in the title and abstract and explain abbreviations when they first appear in the text.
  • Permissions
    If figures are borrowed from published sources, written permission must be obtained from both the publisher and author and a credit line detailing the source should be added to the legend. If text material of 250-300 words, or any tables, are borrowed verbatim from published sources written permission is required from both the publisher and author. With shorter quotations, addition of a bibliographic credit is sufficient. Permission letters for reproduced text or figures must accompany the manuscript. If permission cannot be obtained, this has to be pointed out on submission.