A submitted manuscript must not be associated with any type of research misconduct. This includes fabrication, falsification, and plagiarism with intent to deceive by the authors. The corresponding author must declare in the cover letter to the Editor-in-Chief the following: the submitted manuscript has not been previously published, and the manuscript is not under simultaneous consideration for publication elsewhere, either in whole or in part in any language, except in the form of an abstract. The cover letter must also state if the manuscript contains any portion that may be regarded as redundant or duplicate information; defined as a paper, data, tables, or figures that overlap substantially with already published information. Research involving human participants must comply with the principles of the Declaration of Helsinki (1964). Articles describing research involving animals must state in the Methods section that the work was approved by the applicable institutional ethics committee or review board. The manuscript must also state that informed consent was obtained from participants, when appropriate. The Editor-in-Chief has the right to reject a manuscript if research misconduct is suspected. Policies on the research and publication ethics not stated in these instructions can be found in "Good Publication Practice Guidelines for Medical Journals" (http://kamje.or.kr/publishing_ethics.html) or "Guidelines on good publication" (http://publicationethics.org/static/1999/1999pdf13.pdf).